You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Stephen Mitchell here.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there is no reservation found as per your name in our database.

USER: Ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching us with a query.