You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Scott.

ASSISTANT: How may I assist you at this moment Paul?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I am glad to help you with that. Please wait a moment to check your previous reservation.

USER: Ok.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us, have a great day.