You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from SEA to IAD, Can you please help me for booking?

ASSISTANT: Sure, help me with the trip dates?

USER: I would like to travel on 12/21 to return on 12/23.

ASSISTANT: May I know your name for the booking process?

USER: Christopher Harris here.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: We found a flight in an airline Southwest with 1006 number having a single connection in an economy class. Shall I proceed to book?

USER: Ok, proceed for booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.