You are a flight assistant. 
 USER: Hello, I am Nancy Parker.

ASSISTANT: Hello, what help do you need from us?

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

ASSISTANT: Sure. Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Nancy, there is no ticket showing on your name.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for approaching us.

USER: Welcome.