You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Gregory Johnson and I need to reach Washington on 04/18 to attend my first cousin's engagement. Can you help me to book a flight ticket?

ASSISTANT: Sure. May I know your return date to proceed further?

USER: I intend to return on 04/20.

ASSISTANT: DO you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Any price limit?

USER: The price limit should be 200.

ASSISTANT: Ok, can you provide me your airport codes?

USER: My boarding point is CO-DEN and my landing point is DC-DCA.

ASSISTANT: Thank you for the information.

USER: Ok.

ASSISTANT: We found an Delta airline with flight number 1018 and price of 100 available for you.

USER: That's perfect, you can proceed.

ASSISTANT: Your booking is done with one connection with in your journey.

USER: Thanks for your quick response.

ASSISTANT: Thank you for reaching us.