You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: Can you please help me in reserving a flight ticket to DEN from EWR?

ASSISTANT: Sure, may I know your scheduled travel dates?

USER: My travel dates are from Nov 21 to Nov 23.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your name?

USER: I am Lisa Thompson.

ASSISTANT: Do you have any other requirements?

USER: Yes, I would like to depart in the afternoon. I need a business class ticket.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with your requirements.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.