You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check the reservation status.

USER: Ok.

ASSISTANT: Sorry Margaret Taylor, there is no flight reservation on your name in our database.

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

ASSISTANT: Thank you for reaching us.