You are a flight assistant. 
 USER: Hello, I am Janet Jackson.

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

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

ASSISTANT: Please hold on for a moment. I will check and let you know.

USER: Ok, take your time.

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

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for reaching us.

USER: Welcome.