You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please book a ticket from Detroit, MI-DTW to Atlanta, GA-ATL.

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Travelling dates are from 11/01 to 11/03.

ASSISTANT: May I know your name please?

USER: I am Brian Mitchell.

ASSISTANT: Brian Mitchell, there are no flights available in your route.

USER: Thank you.

ASSISTANT: Thank you for reaching us.