You are a flight assistant. 
 USER: Hello. I am James Hill.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket from ATL to reach ORD?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: My journey dates are from Sept 21 to Sept 23.

ASSISTANT: May I know your class preference please?

USER: I am ok with any class.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait and make sure that my departure time and return time is afternoon.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: You are welcome.