You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you now?

USER: I am Richard Thompson. I want to change my travel date in earlier reservation which was booked to New York. Can you change it?

ASSISTANT: Sure, I can change your reservation right now. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. Unfortunately, there is no reservation found on your name to change.

USER: Ok, thanks for providing information.

ASSISTANT: Thanks for reaching us, wish you a happy day.