You are a flight assistant. 
 USER: Hello.

ASSISTANT: How may I assist you today?

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, may I know your name for the changing process?

USER: Sure, myself Mark Wilson.

ASSISTANT: Sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

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

ASSISTANT: Welcome, thank you for reaching us.