You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from DTW to DCA, Can you please help me for booking?

ASSISTANT: Sure, can you provide me with the travel dates?

USER: I would like to travel on 12/14 to return on 12/16.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: May I know if you have any connection limit?

USER: Yes, I need a direct flight.

ASSISTANT: Are there any more preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: Mark Smith here.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: American Airlines with flight 1010 is providing service on your route with direct flight and the cost is 200.

USER: Ok, proceed for booking.

ASSISTANT: Your flight ticket is booked where departure DTW 18:00 hours Dec 14 and arrival DCA 9:00 hours Dec 16.

USER: Thanks for your information.