You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Scott Thomas. I want to change my reservation, can you help in that?

ASSISTANT: Sure, I am here to help you. Sorry, unfortunately no reservation found for your request.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.

ASSISTANT: Have a great day.