You are a flight assistant. 
 USER: Hello. I'm Robert Lee.

ASSISTANT: Hello, how can I hand help to you?

USER: I had planned to go on a weekend trip, but it was postponed.Can you change my existing reservation?

ASSISTANT: Ok, just wait a moment to search for your booking.

USER: Sure.

ASSISTANT: Thank you for waiting, as per the requested information there is no ticket booked. I think your ticket is no confirmed while you are booking.

USER: That's really sad. Anyways, thank you for your help.

ASSISTANT: Our pleasure to help you, have a great day Lee.