You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: As my sports event was postponed at AUS, I would like to change my recent reservation.

ASSISTANT: Ok, I can help you with that. May I know your name?

USER: Yes, I am Charles Martin.

ASSISTANT: Please wait. I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your patience. We found a reservation on your name.

USER: Ok.

ASSISTANT: Can you please provide your new journey dates?

USER: My origin point is at CLT and destination is at AUS.

ASSISTANT: Can you please provide your source and destination?

USER: Source date is on 12/14 and return date is on 12/16.

ASSISTANT: Please hold on. I will check the availability.

USER: Ok.

ASSISTANT: Thanks for waiting. There are no flights found with your given details.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us. Have a good day.