You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Nicholas Lee, want to travel from LAS to DCA. Will you please help me in booking my ticket?

ASSISTANT: Sure, let me know your travel dates?

USER: My travel dates are from 10/01 to 10/03.

ASSISTANT: Nicholas, please wait for a moment.

USER: Sure.

ASSISTANT: Glad to tell you that, there is a flight called Southwest airlines which costs around 100.

USER: Great, proceed my booking with that flight.

ASSISTANT: I can book that flight for you right now. I am happy to inform you that, the ticket is booked.

USER: Ok, thank you.

ASSISTANT: Thanks for choosing our airlines.