You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am Joseph Williams. I am planning to watch sports live events in Washington, so please book a flight ticket within a price limit of 200.

ASSISTANT: Sure, I am here to support you. Can I have your journey dates please?

USER: I would like to fly on 07/22, return on 07/24.

ASSISTANT: Ok, let me know your selected airport codes.

USER: My source and destination airport codes are NY - JFK, DC - IAD.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thanks for your time, we found a connecting flight with a fare of 300 in 1017 UA airline.

USER: Do not proceed to booking, because my price limit is 200.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thanks for choosing us.