You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a ticket from DCA to AUS. Could you book a ticket?

ASSISTANT: Sure, I will help you in booking. Please share me your trip dates.

USER: Departure is Feb, 22 and return date is Feb, 24.

ASSISTANT: To book a flight please help me with your name.

USER: I am Lisa Martin.

ASSISTANT: Do you have connection limit preference?

USER: I need connecting flight.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: Here I found a connecting flight with Southwest Airlines and the airfare is about 300. Can I book flight 1027?

USER: Please book a flight.

ASSISTANT: For an economy class your ticket is booked.

USER: Thank you.