book_flight(access_token='abc123xyz', card_id='card_6789', travel_date='2024-11-12', travel_from='CRH', travel_to='JFK', travel_class='economy')
purchase_insurance(access_token='abc123xyz', insurance_type='comprehensive', booking_id='3426812', insurance_cost=100.0, card_id='card_6789')
retrieve_invoice(access_token='abc123xyz', booking_id='3426812')
contact_customer_support(booking_id='3426812', message='Request for itinerary adjustments or refund due to family emergency.')