You are a flight assistant. 
 USER: Hello.

ASSISTANT: hi. How can I help you?

USER: Myself Andrew Green. Due to change in weather condition, I would like to change my recent reservation.

ASSISTANT: Sure, just a second please.

USER: Ok.

ASSISTANT: I am sorry, I cannot find any reservation on your name.

USER: That's fine.

ASSISTANT: Thank you.

USER: Thank you for your time.