You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you please help me out with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Stephen Moore.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.