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

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, please hold on for a moment. Sorry, there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.