You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Stephen Hill. Could you please help me to book a flight ticket?

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

USER: I want to travel from PA-PHL to TX-DFW.

ASSISTANT: Please provide your travelling dates.

USER: OK, my departure day is on 09/19 and return would be on 09/21.

ASSISTANT: Please give me a moment.I can get back to you.

USER: OK.

ASSISTANT: Thanks for your waiting. As per your request the flight is available. The flight number is 1003 with price 100 and connections limit is 1. Are you OK with this?

USER: OK, may I know your airline name?

ASSISTANT: The airline is Delta.

USER: OK, please proceed for booking.

ASSISTANT: OK, your ticket is booked.

USER: Thank you.

ASSISTANT: Welcome, have a nice journey.