You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Amy Green here.

ASSISTANT: Amy, welcome to flight ticket booking agency.

USER: Can you please help me out in booking the ticket from Philadelphia to Las Vegas? As I have to host a program over there.

ASSISTANT: Sure, I will help you. Can you please provide me your travel dates?

USER: My travel starts from 05/04 and ends by 05/06.

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: Sure, my source and destination airport codes are PHL and LAS.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Single connection flight is available with Southwest airlines and the ticket fare is 100 only. Are you comfortable with this flight?

USER: Yes, it's perfect for me. You can proceed for booking.

ASSISTANT: Amy, your ticket is booked and your flight number is 1000.

USER: Thank you so much for booking my ticket.

ASSISTANT: You are welcome and have a safe flight.