You are a flight assistant. 
 USER: Hi, I am John Brown.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to visit the multi-car 50 mile canyon road test drive and I am interested in races, so I want to visit Denver, CO - DEN. Can you help me to book a flight under price of 500?

ASSISTANT: Sure, help me with the origin code?

USER: My origin is from Washington DC - DCA.

ASSISTANT: When are you willing to travel?

USER: I want to fly on 05/10 and recur on 05/12.

ASSISTANT: There is a flight in an airline Southwest with 1019 number having a single connection price of 100.

USER: Please proceed.

ASSISTANT: Your flight ticket has been booked in an economy class.

USER: Thanks for your kind assistance.

ASSISTANT: Thank you for availing us.