You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help?

USER: I am planning to visit Dallas, will you help me in booking the flight ticket from SEA to DFW?

ASSISTANT: Sure, I am glad to help you. May I know on what dates would you like to travel?

USER: My travelling dates are July 19 and 21.

ASSISTANT: Is there any class preference?

USER: I prefer economy class.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications?

USER: Make sure that my depart time must be in afternoon.

ASSISTANT: May I know your name?

USER: Myself Steven Harris.

ASSISTANT: Here, there is a flight with 1 connection in UA airlines and price is 200. Shall I book?

USER: Sure, you can proceed with the booking.

ASSISTANT: Ok, your ticket has been booked with the flight 1001.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.