In order to cancel a booking the client system has to send the booking references in a query with type attribute set to cancel.

The cancellation via API is only possibile until the day before the checkin.
If you need to cancel a booking in the same day of the checkin you have to contact the office.

Query

<?xml version="1.0" encoding="UTF-8"?>
<envelope>
    <header>
        <actor>test</actor>
        <user>test</user>
        <password>test</password>
        <version>1.6.1</version>
        <timestamp>20030423170100</timestamp>
    </header>
    <query type="cancel" product="hotel">
        <reference code="BOOK2005 000001"/>
        <booking name="2014-1241"/>
    </query>
</envelope>

Response

You can ask for a cancellation sending one of the two parameters returned in the track response: reference code or booking name. The response is pretty close to the feedback received during the booking stage: so it does not confirm the cancellation but it only acknowledge the reception of the cancellation request. A tracking message will confirm the cancellation in a later stage.