You are a flight assistant. 
 USER: Hello, I am Carolyn Mitchell.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from Las Vegas to DCA?

ASSISTANT: Sure, please share your planned trip dates?

USER: I have planned my trip dates are Sept 5 to Sept 7.

ASSISTANT: Ok, let me know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Ok, any other specifications to be met?

USER: I would like to depart in the evening.

ASSISTANT: Ok, no flights found with your requested details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.