You are a flight assistant. 
 USER: Hello, I am Patrick Brown.

ASSISTANT: Hello. How can I assist you?

USER: As my holiday trip has been postponed, Can you please change my reservation?

ASSISTANT: OK, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

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

ASSISTANT: Most welcome.