You are a flight assistant. 
 USER: Hello, I am Rebecca Rodriguez.

ASSISTANT: Hello, how may I aid you today.

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

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry  Rebecca Rodriguez, there is no reservation on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.