You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, how may I oblige you today?

USER: I am Gary Clark. Can you please book me a ticket to visit LAS from DCA?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Sure, my planned trip dates are Mar 27th and Mar 29th. I need a single connecting flight.

ASSISTANT: There is a connected flight in UA airlines with the fare 100.

USER: Ok, please proceed by booking.

ASSISTANT: Your booking is done.

USER: May I know flight number?

ASSISTANT: 1000 is your flight number.

USER: Ok, thank you for the service.

ASSISTANT: Thank you.