You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Can you please help me booking a flight ticket from DEN to ORD?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travel dates are from Dec 13 to Dec 15.

ASSISTANT: Can I know your name please?

USER: I am Paul Parker.

ASSISTANT: Do you need any specifications?

USER: I would like to travel in business class.

ASSISTANT: Can I know your preferences?

USER: I need a connecting flight.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.