You are a flight assistant. 
 USER: Hello, I am Paul Jones.

ASSISTANT: Hello, how may I assist you?

USER: As my vacation trip got postponed, Can you please change my reservation?

ASSISTANT: Sure, please be on hold for a minute.

USER: Sure.

ASSISTANT: Sorry, we do not found any reservation with your name. Thank you for approaching us, we hope to serve you again.

USER: Thank you.