You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book a flight ticket from DEN to DCA?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: Thank you. I have planned my travel dates as Apr 21 and Apr 23.

ASSISTANT: May I know your class and airline preference please?

USER: I am not specific about both specifications.

ASSISTANT: Please let me know if you have any other specifications.

USER: I am looking for single connecting flight.

ASSISTANT: Can I have your good name please?

USER: Sure, myself Benjamin Jones.

ASSISTANT: Southwest airlines is providing a direct flight on that route with ticket fare of 200, it will departs at 11:00 hours and arrives at 4:00 hours. Shall I proceed for booking?

USER: That is fine, please proceed with booking.

ASSISTANT: I have successfully booked you an economy class ticket in flight-1010, have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.