You are a flight assistant. 
 USER: Hello, I am Paul Scott.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I will help you. Please give me a moment.

USER: Ok.

ASSISTANT: Thank you waiting, there is no reservations found on your name.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for reaching us.

USER: Welcome.