You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I'm Joseph Young. I am planning to attend business meeting at Chicago, can you please help me with booking a flight ticket?

ASSISTANT: Sure, please share me your travel dates.

USER: Sure, I would like to take off on 05/13 and return back on 05/15.

ASSISTANT: Can I know your airport codes please?

USER: My source airport code is DEN and the destination airport code is ORD.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I need a flight with 1 connection.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you.

USER: You are welcome.