# Modify Reservation

## PATCH /reservations/{bookingReferenceId}

> Modify an existing reservation. This endpoint allows updating guest information for the primary guest and individual room guests. Note that this endpoint can only modify non-price impacting details of the reservation.

```json
{"openapi":"3.0.0","info":{"title":"Channels Plus Channel API","version":"0.0.1"},"paths":{"/reservations/{bookingReferenceId}":{"patch":{"operationId":"modifyReservation","description":"Modify an existing reservation. This endpoint allows updating guest information for the primary guest and individual room guests. Note that this endpoint can only modify non-price impacting details of the reservation.","parameters":[{"$ref":"#/components/parameters/SmApiId"},{"$ref":"#/components/parameters/SmApiKey"},{"name":"bookingReferenceId","description":"The unique identifier of the reservation to be modified","required":true,"in":"path","schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"type":"object","additionalProperties":false,"properties":{"guestTitle":{"type":"string","nullable":true,"description":"The title of the primary guest (e.g., Mr., Mrs., Ms., Dr.)"},"guestFirstName":{"type":"string","nullable":true,"description":"The first name of the primary guest"},"guestLastName":{"type":"string","nullable":true,"description":"The last name of the primary guest"},"guestEmail":{"type":"string","nullable":true,"description":"The email address of the primary guest"},"guestPhoneNumber":{"type":"string","nullable":true,"description":"The phone number of the primary guest"},"guestAddress":{"type":"string","nullable":true,"description":"The street address of the primary guest"},"guestCity":{"type":"string","nullable":true,"description":"The city of residence for the primary guest"},"guestState":{"type":"string","nullable":true,"description":"The state or region of residence for the primary guest"},"guestPostcode":{"type":"string","nullable":true,"description":"The postal or zip code of the primary guest"},"guestCountry":{"type":"string","nullable":true,"description":"The country of residence for the primary guest"},"guestRemarks":{"type":"string","nullable":true,"description":"Any additional remarks or special requests from the primary guest"},"rooms":{"type":"array","description":"An array of rooms in the reservation, allowing individual guest information updates","items":{"type":"object","additionalProperties":false,"properties":{"roomUuid":{"type":"string","description":"The unique identifier of the room in the reservation"},"guestTitle":{"type":"string","nullable":true,"description":"The title of the guest for this specific room"},"guestFirstName":{"type":"string","nullable":true,"description":"The first name of the guest for this specific room"},"guestLastName":{"type":"string","nullable":true,"description":"The last name of the guest for this specific room"},"guestRemarks":{"type":"string","nullable":true,"description":"Any additional remarks or special requests for this specific room"}},"required":["roomUuid"]},"maxItems":10}}}}}},"responses":{"200":{"description":"Successful response. The reservation has been modified successfully.","headers":{}},"400":{"$ref":"#/components/responses/BadRequest"},"401":{"$ref":"#/components/responses/Unauthorized"},"404":{"$ref":"#/components/responses/NotFound"},"500":{"$ref":"#/components/responses/ServerError"}}}}},"components":{"parameters":{"SmApiId":{"name":"x-sm-api-id","description":"The api id for channel","required":true,"in":"header","schema":{"type":"string"}},"SmApiKey":{"name":"x-sm-api-key","description":"The api key for channel","required":true,"in":"header","schema":{"type":"string"}}},"responses":{"BadRequest":{"description":"Invalid request","headers":{},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"Unauthorized":{"description":"Unauthorized","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"NotFound":{"description":"The specified resource was not found","headers":{},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"ServerError":{"description":"Unexpected error occurred","headers":{},"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}}},"schemas":{"Error":{"type":"object","required":["errors"],"properties":{"errors":{"minItems":1,"type":"array","description":"An array of error objects, for most errors, this array would only contain one error object. An errors array must contain at least one error object.","items":{"type":"object","required":["code"],"properties":{"code":{"type":"string"},"message":{"type":"string"},"meta":{"type":"object"}}}}}}}}}
```

{% hint style="success" icon="sparkles" %}

## Still have questions?

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{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developer.siteminder.com/channels-plus-api/reference/modify-reservation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.