# Checking Availability The AvailbilityRequest determines if the requested activity has availability for a specific number of passengers in real-time. This API call allows for requesting availability for a single date, a date range and also a single time if the tour offers multiple departure times (optional). --- # 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://docs.zaui.com/io/api-function-definitions/checking-availability.md?ask= ``` 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.