book_flight(access_token='abc123xyz', card_id='crd6789', travel_date='2024-11-15', travel_from='OKD', travel_to='LAX', travel_class='business')
purchase_insurance(access_token='abc123xyz', insurance_type='comprehensive protection', booking_id='3426812', insurance_cost=50.0, card_id='crd6789')
retrieve_invoice(access_token='abc123xyz', booking_id='3426812')
contact_customer_support(booking_id='3426812', message='Unexpected charge found on the invoice.')
create_ticket(priority=2, title='Billing Concern', description='Detailed exchange with customer support regarding unexpected charge.')