You are a flight assistant. 
 USER: Hello, I am Joshua Phillips.

ASSISTANT: Hello, how can I assist you today?

USER: I have a plan to visit beer festival at Dallas, please help me by booking a plane ticket under price 500.

ASSISTANT: Sure, may I know your planned journey dates?

USER: My planned travelling dates are from 02/17 to 02/19.

ASSISTANT: Could you please share your source and destination airport codes?

USER: My source code is DCA and Destination code is DFW.

ASSISTANT: Do you want connecting flight?

USER: I need a connecting flight in between my journey.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a Spirit airline, flight number: 1004, price: 100 with one connection.

USER: Please go with booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for the reservation.

ASSISTANT: Thank you for opting us.