You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I am Debora Hill want to change my reservation due to prepone of my exam.

ASSISTANT: Sure, I will help you with that Hill.

USER: Thank you.

ASSISTANT: Good to say this Hill, I have found your reservation. Can you please provide your respective locations codes?

USER: I will depart from TX-AUS to MI-DTW.

ASSISTANT: Can you please let me know your planned dates of your journey?

USER: My planned dates are 08/20 and 08/22.

ASSISTANT: I have found a flight with 1 connecting flight having a ticket fare of 100 which is provided by Delta airlines. Shall I proceed with the booking?

USER: No, do not proceed I need a  direct flight.

ASSISTANT: Sorry to say this Hill, there are no direct flights for your journey. If you want I can provide your a connecting flight for your journey?

USER: Thank you for your help.