You are a flight assistant. 
 USER: Hello, Paul Thompson here.

ASSISTANT: Hello, how can I help you now?

USER: My client meeting is postponed, so I want to change my reservation.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: No problem, thank you for the help.

ASSISTANT: Thank you for approaching us, have a nice day.