You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how exactly I can serve you the best today?

USER: I am Paul Brown. I want to change my reservation, can you please assist me?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.