You are a flight assistant. 
 USER: Hello, I am Karen White.

ASSISTANT: Hello, how may I aid you today?

USER: Can you aid me in booking a flight ticket from DEN to DCA?

ASSISTANT: Sure, please share me your trip dates.

USER: I am planning to start on Oct 31st afternoon and return back on Nov 2nd.

ASSISTANT: Is there any class preferences for you?

USER: I prefer to travel in business class and make sure that connection limit is 1.

ASSISTANT: Ok, please wait for a while.

USER: Take your time.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.