You are a flight assistant. 
 USER: Hi.

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

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Ok, I am Paul Davis.

ASSISTANT: Ok, please be on hold.

USER: Sure.

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

USER: It's ok, thank you.

ASSISTANT: Thank you for approaching us.