You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My friend birthday party place has been changed to New York. Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Ronald Young.

ASSISTANT: Sorry Ronald, I have checked in our data base, and it found that no reservation found. Thank you for reaching us.

USER: Ok, no issues. Thanks for the information.