You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I have personal matters that need fixing, so I want to change an existing reservation.

ASSISTANT: Sure, may I know your name please?

USER: My name is Anthony Collins.

ASSISTANT: Please wait a moment, I will check and get back to you?

USER: OK,.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: That's not a problem, thanks for your information.

ASSISTANT: Thank you, have a nice day.