list_all_airports()
get_flight_cost(travel_from='RMS', travel_to='BOS', travel_date='2024-10-31', travel_class='business')
book_flight(access_token='abc123xyz', card_id='main1234', travel_date='2024-10-31', travel_from='RMS', travel_to='BOS', travel_class='business')
purchase_insurance(access_token='abc123xyz', insurance_type='comprehensive', booking_id='3426812', insurance_cost=769.0, card_id='main1234')
retrieve_invoice(access_token='abc123xyz', booking_id='3426812')
contact_customer_support(booking_id='3426812', message='Booking-related query.')
cancel_booking(access_token='abc123xyz', booking_id='3426812')