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