You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best I can serve you at this moment?

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, we are here to help you.

USER: Thank you for considering my request.

ASSISTANT: May I know your name please?

USER: Sure, my name is Dennis Hall.

ASSISTANT: Sorry we could not find any reservation against your name.

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

ASSISTANT: Thank you for approaching us.