compute_exchange_rate(base_currency='RMB', target_currency='USD', value=20000.0)
set_budget_limit(access_token='abc123xyz', budget_limit=2857.14)
book_flight(access_token='abc123xyz', card_id='card_3478', travel_date='2024-02-28', travel_from='JFK', travel_to='LAX', travel_class='business')
close_ticket(ticket_id=83912)