You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Williams.

ASSISTANT: How may I aid you?

USER: I would like to change my reservation as I am leaving for hometown, can you please help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please give me a moment to check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry, we couldn't find any reservation on your name.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome.