You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I need to travel Atlanta in the month of December to attend an event there. Can you help me in book a connected flight for my journey from Chicago?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Thanks for reacting positive about my query. My travel dates are Dec 10 and Dec 12.

ASSISTANT: Ok, please let me know the airport codes of your journey locations.

USER: Sure, my airport codes are ORD and ATL.

ASSISTANT: Do you have any specific timings of your journey.

USER: I need to have a return journey in the afternoon.

ASSISTANT: Ok, please let me know your preferable class to get exact flight for you.

USER: I do not have any such class preference.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Carol Evans.

ASSISTANT: Thank you for choosing us, have a good day.