You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Taylor.

ASSISTANT:  Kevin Taylor. How can I help you?

USER: Can you please book a flight ticket from DEN to ORD?

ASSISTANT: May I know the travel dates?

USER: My travel dates are Dec 30th and Jan 1st.

ASSISTANT: Is there any time concern?

USER: The return time should be morning.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know the airline preference?

USER: I am ok with any airline.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: Give me a moment?

USER: Sure.

ASSISTANT: Sorry to inform that there are no flights on your route.

USER: Ok, thanks for sharing the information.