get_flight_cost(travel_from='CRH',travel_to='RMS',travel_date='2022-07-15',travel_class='business')
set_budget_limit(access_token='access_token_abc123', budget_limit=2000.0)
book_flight(access_token='access_token_abc123', card_id='card7320', travel_date='2022-07-15',travel_from='CRH',travel_to='RMS', travel_class='business')
retrieve_invoice(access_token='access_token_abc123', booking_id='3426812')
contact_customer_support(booking_id='3426812', message='Concern regarding seating arrangements')