For Neople :)

Is there a specific app this action is for?
Booking Experts

Please provide a link to the relevant API docs for the specific service / operation.
https://developers.bookingexperts.com/reference/introduction-to-the-api-documentation

PATCH Guests -> https://api.bookingexperts.com/v3/administrations/{administration_id}/reservations/{reservation_id}/guests/{id}

GET rentable_type availabilities -> https://api.bookingexperts.com/v3/channels/{channel_id}/rentable_types/{rentable_type_id}/availabilities

GET availabilities -> https://api.bookingexperts.com/v3/availabilities

GET booking -> https://api.bookingexperts.com/v3/administrations/{administration_id}/bookings/{id}

DELETE guest -> https://api.bookingexperts.com/v3/administrations/{administration_id}/reservations/{reservation_id}/guests/{id}