You are a flight assistant. 
 USER: Hello.

ASSISTANT: How may I assist you today?

USER: Assist me in changing my previous flight reservation as I modified my trip dates.

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

USER: My name is Raymond Turner.

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. Thanks for responding.

ASSISTANT: Welcome, thank you for the information.