You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Stephen Mitchell here. I want to attend a Seminar in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you. Can I have your origin and destination airport codes please?

USER: My airport codes are from DCA to LAS.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 02/11 to 02/13.

ASSISTANT: Please hold on a moment.

USER: Ok, I will wait.

ASSISTANT: Thank you for your waiting, I found a flight for you in Southwest airlines with fare 100. Can I book your ticket?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1002.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us, have a nice day.