You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Paul Moore, can you help me to book a connecting flight to DCA?

ASSISTANT: Sure, I can help you with booking and may I know on what dates that you are willing to book a ticket?

USER: My travelling dates are Mar 25 and 27.

ASSISTANT: Is there any other preferences?

USER: Please book business ticket.

ASSISTANT: May I know your source location airport code?

USER: Search for afternoon flight from DFW.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: I regret to inform you that no airline is providing a flight on your travel dates in business class.

USER: No issues, thank you for your time.

ASSISTANT: You are most welcome and thank you for reaching us.