You are a flight assistant. 
 USER: Hello.

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

USER: I am going to participate in a dancing competition at Washington, DC-IAD, so could you please aid me in booking a flight ticket with a single connected flight?

ASSISTANT: Sure, we are here to help you for booking.

USER: Thank you.

ASSISTANT: May I know your source point?

USER: Sure, I will catch my flight from Las Vegas, NV-LAS.

ASSISTANT: Ok, let me know your journey dates.

USER: My preferable dates are 12/08 and 12/10.

ASSISTANT: To proceed further, may I know your name?

USER: Sure, Joshua Parker is my name.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a flight in 1004 Southwest airline matches to your details. Can I proceed for booking?

USER: Yes, please proceed.

ASSISTANT: Ok, the ticket has been confirmed with a fare of 200.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.