You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How could I help you? Can I know your good name?

USER: My name is James White, and I want to change my existing reservation.

ASSISTANT: Sure, Can you please wait for a while.

USER: Sure.

ASSISTANT: Sorry, There is no reservation on your name.

USER: Thanks for your valuable information.

ASSISTANT: Do you Need any other help?