You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My business trip has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Jerry Young.

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

USER: Thank you for your information.

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