You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a flight ticket from DCA to LAS.

ASSISTANT: Please provide me your itinerary travel dates.

USER: My travel dates are from Aug, 22 to Aug, 24.

ASSISTANT: Is there any time concern?

USER: No.

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

USER: I need a single connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: Let me know your name please?

USER: Donald Green.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: American Airlines with flight 1012 is providing service on your route with connecting flight and the cost is 200.

USER: Please proceed.for booking.

ASSISTANT: Your ticket is booked where departure DCA 0:00 hours Aug 22 and arrival LAS 3:00 hours Aug 24.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.