You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Stephanie Hall. I want to change my existing reservation, can you help me with that?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Please, take you time.

ASSISTANT: I found your reservation, can you please provide the new airport codes?

USER: Ok, my new origin airport code is AUS and the destination airport code is LGA.

ASSISTANT: Could you please help me with the travel dates?

USER: Yes, my departure date is 03/29 and the return date is 03/31.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok. Please see that there is a connecting flight.

ASSISTANT: Stephanie, there is a flight available with price 100 and the connection is 1 with Delta airline. Would you like me to proceed with the booking?

USER: That is perfect, please proceed.

ASSISTANT: Your booking is confirmed with 1001 flight number.

USER: Thank you for helping me to change the reservaion.

ASSISTANT: You are welcome. Thank you for choosing our service.