You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Ok, may I know your name for further search?

USER: Sure, my name is Christopher Young.

ASSISTANT: Sorry, reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.