You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket from DEN to DCA. Can you make a reservation for me?

ASSISTANT: Sure, I will help you in booking. Can you please share your trip dates?

USER: Ok, my planned trip dates are on June 07 and return on June 09.

ASSISTANT: Do you have any connection limit preference?

USER: Ok, I need a single connecting flight.

ASSISTANT: May I know your name to proceed further?

USER: Yes, I am Cynthia Taylor.

ASSISTANT: Cynthia Taylor, sorry there are no flights found for the given dates.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.