You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to book a flight ticket from PHL to DEN?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travel dates are Oct 18 and Oct 20.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Any other requirements to be met?

USER: I would like to prefer business class flight ticket.

ASSISTANT: May I know your good name?

USER: I am Jonathan Jones.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.