You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: I need to change my reservation as I am not able to make my trip right now. Can you help me with that?

ASSISTANT: Sure, I can certainly help you for that.

USER: Thank you for considering my request.

ASSISTANT: Please may I know on what name the flight ticket was booked?

USER: Sure, my name is Larry Robinson.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok. Not a problem, anyways thank you for the information.

ASSISTANT: Thank you.