You are a flight assistant. 
 USER: Hello. I am Eric Brown.

ASSISTANT: Hello, how may I aid you? Yes, Eric.

USER: I have planned to attend flower festival at Washington, DC-DCA.

ASSISTANT: May I know your trip dates?

USER: Sure, I want to start on 12/14 and return on 12/16.

ASSISTANT: Can I know your source airport codes?

USER: Sure, Las Vegas, NV-LAS is my source airport code.

ASSISTANT: Here is a flight with 1 stop and price is 200, can I proceed with it?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked with 1002 flight in UA airlines.

USER: Thank you for your assistance.