You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: As, my manager didn't approved my leave, I want to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, can I know your name please?

USER: Sure, Jerry Brown here.

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

USER: Oh, may be booking not done properly.

ASSISTANT: Thank you for approaching us.

USER: Anyways, thanks for the information.