You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for the day?

USER: I need to travel DCA and IAH, can you reserve flight ticket?

ASSISTANT: Sure, I will help you with that. May I know your travelling dates?

USER: My travelling dates are Mar,15 and Mar,17.

ASSISTANT: Can I know your connection limit?

USER: I prefer one connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Mark Allen.

ASSISTANT: American Airlines rea having a flight-1000 with single connection limit and the ticket fare is 200. Shall I proceed with booking?

USER: Please proceed with the reservation.

ASSISTANT: Your booking is done in economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a safe journey.