You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Shirley Moore. Can you please assist me in changing my existing reservation which I have done earlier?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: No problem, thank you for your time.

ASSISTANT: Thank you.