You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at present?

USER: Carolyn Perez here. I would like to book a  flight from DEN to DCA where I would like to meet my college friends.

ASSISTANT: Sure, May I know your planned journey dates?

USER: My itinerary travel dates are Sept 21 and Sept 23.

ASSISTANT: Let me know your connection limit.

USER: I would like to board a connecting flight.

ASSISTANT: Ok, Do you have any other requirements?

USER: No, I have no more preferences.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to notify you that, there were no flights found based on your scheduled dates.

USER: No issue, thank you very much for the assistance.

ASSISTANT: Thank you for reaching us.