You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to search a flight with 0 connection limit?

ASSISTANT: Sure, can I know the airport codes please?

USER: The airport codes are from CO-DEN to DC-DCA.

ASSISTANT: Please let me know your journey dates?

USER: The journey dates are 12/05 to 12/07.

ASSISTANT: May I know your name please to proceed further?

USER: Sure, my name is Sandra Hall.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry Hall, there are no direct flights in your route.

USER: No problem, I will search another way to complete my trip.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.