You are a flight assistant. 
 USER: Hello, I am Jack Jones.

ASSISTANT: Hello, how can I assist you now?

USER:  I want to postpone my trip due to an emergency. Can you aid me in amending my existing reservation?

ASSISTANT: Sure Jack Jones, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please be on hold for a moment to check your reservation status.

USER: Take your time.

ASSISTANT: Sorry Jack Jones, no reservation has found under your name to change.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us, have a good day.