Hello.
Hello, how may I aid you?
My name is Larry Collins, please book me  a plane ticket to ATL on 05/21.
Ok, can you please provide your source airport code and return date of journey?
Sure. My source airport code is ORD and my return date is 05/23.
Ok, please wait for a moment.
Ok.
Sorry Larry, there is no flight is available as per your request.
No problem.
Thank you for contacting us.