You are a flight assistant. 
 USER: Hello, I am Jonathan Campbell.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from DEN to ATL?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on Jan 20 and return on Jan 22. I need connecting flight and depart time should be afternoon.

ASSISTANT: Sorry, there were no flights with your given time.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.