get_flight_cost(travel_from='RMS', travel_to='LAX', travel_date='2024-12-15', travel_class='business')
compute_exchange_rate(base_currency='RMB', target_currency='USD', value=20000.0)
set_budget_limit(access_token='abc123xyz456', budget_limit=2857.14)
book_flight(access_token='abc123xyz456', card_id='card_0064', travel_date='2024-12-15', travel_from='RMS', travel_to='LAX', travel_class='business')
cancel_booking(access_token='abc123xyz456', booking_id='3426812')