You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Richard Campbell.

ASSISTANT: How can I assist you for the day?

USER: Can you please book a flight ticket from DFW to DTW?

ASSISTANT: Sure, I am here to help you with that flight ticket booking. Can you please share your preferable travel dates?

USER: My journey dates are, depart on Sep 8th, and return back on Sep 10th.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a connection in between journey.

ASSISTANT: please share if you want to travel in any specific time?

USER: My depart time in the evening.

ASSISTANT: Do you prefer either business or economy class?

USER: I am ok with any class.

ASSISTANT: There is no flight found on this route as per your travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.