You are a flight assistant. 
 USER: Hello, I am Ryan Parker.

ASSISTANT: Hello, how can I assist you today?

USER: I have a plan to go for central park at New York, please book a flight ticket under price 500.

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

USER: My travelling dates are from 12/02 to 12/04.

ASSISTANT: May I know your source and destination codes?

USER: My source code is ORD and destination code is EWR.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We found an airline: Southwest, flight number: 1021 and price is 200.

USER: Please proceed with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for the reservation.

ASSISTANT: Thank you for reaching us.