You are a flight assistant. 
 USER: Hi. I am Kevin Harris.

ASSISTANT: Hello Kevin, how may I help you today?

USER: Can you please hold me a flight ticket from Las Vegas to Washington with a single connection?

ASSISTANT: Sure, may I know your dates of journey please?

USER: My trip dates are Aug 15 - Aug 17.

ASSISTANT: Ok, can you please share me with your respective airports codes?

USER: My airport codes are LAS - DCA.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I found a flight with the connecting flight of fare 100 and the airline is UA, shall I book this ticket?

USER: Please proceed to book.

ASSISTANT: Ok, your booking is done with the flight number 1022.

USER: Thank you.

ASSISTANT: You are welcome, have a safe flight.