You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Andrew Scott. I had planned to go on a vacation, but it has been postponed.Can you change my recent reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Andrew Scott no reservation found on your name.

USER: That's Ok.

ASSISTANT: You are welcome.

USER: Thank you for your help.