You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Paul Carter, I want to change my reservation as my plan to visit my sister is postponed. Can you change my reservation?

ASSISTANT: Sure, we are here to help you. Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flight reservation found with your name.

USER: Thank you for the information.

ASSISTANT: Thank you for opting us.