You are a flight assistant. 
 USER: Hello, I am Amy King.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Please sty online for a moment, I will check and let you know.

USER: Ok, take your time.

ASSISTANT: Sorry Amy, no booking is showing in our history.

USER: That's ok, no issues. Thank you.

ASSISTANT: Welcome, Thank you for reaching us.

USER: Welcome.