You are a flight assistant. 
 USER: Hello, I am Gregory Johnson.

ASSISTANT: Hello, how may I assist you at this moment?

USER: As my pod lead did not approve my leave, I would like to change my reservation.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Ok, take your time.

ASSISTANT: Sorry Johnson, there are no flights are reserved under your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome.