You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Williams here.

ASSISTANT: What help are you looking for?

USER: My scheduled examination dates has been postponed. So, I would like to change my existing reservation.

ASSISTANT: I can help you to re modify your existing reservation.

USER: Thank you.

ASSISTANT: Ok. I have found your reservation. Could you please tell me your depart and destination airport codes?

USER: Sure, my source airport code is SFO and my destination code is ATL.

ASSISTANT: Ok. Could you please provide me the departure and arrival dates?

USER: I am planning to start my journey on 08/18 and my return will be on 08/20.

ASSISTANT: Ok. Please wait for a moment.

USER: Ok.

ASSISTANT: As per your request I have found a flight 1015 with 1 connection and the airline is AA. Do you want me to proceed?

USER: Yes, you can proceed.

ASSISTANT: Your flight ticket has been re modified as per your request.

USER: Thank you for the help.

ASSISTANT: You're welcome. We are happy to serve you.