You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I have planned to visit some places in Atlanta, ATL. So please help me to book a flight ticket from DCA.

ASSISTANT: Yes sure. Let me know your preferable dates?

USER: My preferable dates are 12/18 and 12/20.

ASSISTANT: May I know your name?

USER: My name is Linda Taylor.

ASSISTANT: I have found a flight-1008 of Southwest airlines, price is 200. Shall I proceed?

USER: Yes, please proceed to confirm my ticket.

ASSISTANT: Your ticket is booked, have a great flight.

USER: Thank you for helping me.

ASSISTANT: You are welcome.