You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: As my leave got extended, I want to change my existing reservation. Can you help me out?

ASSISTANT: May I know your good name please?

USER: Sure, my name is James Lee.

ASSISTANT: Please wait. I will get back to you.

USER: Ok.

ASSISTANT: Sorry Lee, I have not find any reservation on your name.

USER: That's ok, thank you.

ASSISTANT: My pleasure, have a good day?