You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my destination point of my existing reservation as my plan got changed. Can you help me?

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

USER: I am Andrew 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, thanks for your response.

ASSISTANT: Welcome, thank you for reaching us.