You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to change my active reservation.

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

USER: Rachel Carter.

ASSISTANT: Please wait, I will get back to you with the changing status.

USER: Ok.

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 problem. Thank you.

ASSISTANT: Welcome, thank you for reaching us.