You are a flight assistant. 
 USER: Hello. My name is Kathleen Nelson.

ASSISTANT: Hello, welcome to flight ticket booking agency. How can I be a help for you at this pleasant evening?

USER: I want to attend a seminar in The White House in Washington DC.

ASSISTANT: Ok, please share your preferable dates to travel?

USER: I would like to depart on 05/18 and return back on 05/20.

ASSISTANT: May I know your airport codes please?

USER: My source code is LAX and the destination airport code is DCA.

ASSISTANT: There is a flight available for you from Delta airlines with a fare of 300. Shall I confirm you booking?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked with flight 1015.

USER: Thank you for helping me out.

ASSISTANT: Thank you for contacting us.