You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Can you help me to book flight ticket from LAS to IAD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My trip dates are Jan 8 and Jan 10.

ASSISTANT: Ok, do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok.

ASSISTANT: I found a flight for you with United Airlines and it costs you 200. Shall I proceed?

USER: May I know whether it is direct flight or connecting flight.

ASSISTANT: Yes, it is a direct flight. Shall I proceed?

USER: Ok, proceed for booking.

ASSISTANT: On whose name you would like to book this ticket?

USER: Jacob Clark.

ASSISTANT: Your ticket has been booked with 1019 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.