You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to spend some more days with my mother, please help me in changing my existing reservation.

ASSISTANT: Sure, may I know your name for the changing process?

USER: My name is Dorothy Parker.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Welcome, thank you fro reaching us.