You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: My trip was postponed so can you please change my travel dates in my previous reservation?

ASSISTANT: Yes, I will help you in change of flight ticket reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Benjamin Smith.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: It.

ASSISTANT: Sorry I could not find your flight reservation to change it. Thank you.