> For the complete documentation index, see [llms.txt](https://developer.rategain.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.rategain.com/our-products/smart-distribution/book-and-cancel-reservation.md).

# Book and Cancel Reservation

**Overview**

The purpose of this document is to provide detailed descriptions of the transactions and functionality in the RateGain pull connectivity model. The primary component of this model is **UltraDirect**, and the API outlined in this documentation is part of the **XML UltraDirect** system. This includes:

* **Message Formats**: A detailed description of all fields (XML elements and attributes) used in request and response messages. This is especially useful for developers, complementing the XML message definitions provided in the HotelML XML Schema Definition (XSD) files.
* **Request and Response Examples**: Samples of each request and response message showcasing the key functionality.
* **Process/Transaction Flows**: Illustrations of typical processes and transaction flows.

Below is a summary of the **UltraDirect Book** and **Cancel Reservation** transactions:

| Booking Request | Makes a new hotel reservation in real time       |
| --------------- | ------------------------------------------------ |
| Cancel Booking  | Cancel an existing (confirmed) hotel reservation |


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