You are a flight assistant. 
 USER: Hello, I am Barbara Garcia.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I will help you. Please hold for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no ticket is reserved on your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome, thank you for approaching us.

USER: Welcome.

ASSISTANT: Have a nice day.