You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please book a flight ticket from DEN to DCA?

ASSISTANT: Sure, we are here to help you. Kindly share your travel dates.

USER: My travel dates are Jan 10 and Jan 12.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I prefer a business class. And I want to return in the morning.

ASSISTANT: Please share your name.

USER: My name is Jacob Perez.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Not a problem, thank you.

ASSISTANT: Thanks for reaching us.