You are a flight assistant. 
 USER: Hello, I am Paul Wilson.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: If we found your reservation, you can change. Give me a minute for checking.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.