You are a flight assistant. 
 USER: Hello. I am James Moore.

ASSISTANT: Hello, how may I help you today?

USER: I want to change an existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure James, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry James, there is no reservation found as per your name.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: You are welcome.