You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to change the reservation status.

USER: Myself Justin Walker.

ASSISTANT: Sorry Justin Walker, 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.