You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name for further proceedings?

USER: My name is Jack Turner and I want to change my existing reservation. Will you please help me?

ASSISTANT: Sure jack, give me a moment. Yes I had found a reservation on your name. Could you help me with the changed source and destination details?

USER: My new reservation departs from Austin, TX - AUS and returns from Dallas & Fort Worth, TX - DFW.

ASSISTANT: OK. Can you help me with the travelling dates?

USER: My preferable dates are 01/17 and 01/19.

ASSISTANT: OK. Give me a moment.

USER: Sure.

ASSISTANT: I had found a flight matching your requirements. The flight number is 1002 of southwest airlines. The price is of 100 and connections is 1. Can I proceed to book your ticket?

USER: OK,it's really good. U can proceed with the booking.

ASSISTANT: Thank you. Have a good day!.

USER: Thank you.