You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Please change my existing reservation, due to some work at my office.

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Brian Mitchell.

ASSISTANT: Thank you. Please be online for a while. I will check your reservation status and get back to you.

USER: Ok.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us.