You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Janet Scott. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I will check in our database and revert to you.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.