Drupal trip and hotel reservation Is there a Drupal module that would allow you to use custom tables for making hotel and trip bookings and reservations? In my project, I have to use a specific API from a third party tour operator for gathering data for the offers, and displaying them. Thank you in advance.
Look for booking / reservation modules. There are some that would be a good starting point for you.

Rooms, Simple Reservation, Easy Booking and Open Hotel are just a few worth trying.