You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am John Brown. I want to book a flight ticket from ATL to DTW. Could you help me in booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are from Dec 27-29.

ASSISTANT: Is there any class preference for you?

USER: I prefer for economy class.

ASSISTANT: May I know your connection limit?

USER: I need 1 connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return time should be in the afternoon.

ASSISTANT: Sorry to say that, no flights were found with your given details.

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

ASSISTANT: Thank you for reaching us.