You are a flight assistant. 
 USER: Hello, I am Deborah Campbell.

ASSISTANT: Hello, how can I best assist you today?

USER:  I have planned for a round trip from CO-DEN to CO-DEN to speed time with my friend, help me in booking my flight ticket.

ASSISTANT: Sure, may I know your schedule dates?

USER: My travelling days are from 06/15 to 06/17.

ASSISTANT: Is there any price limit?

USER: I want a price limit 500.

ASSISTANT: Sorry there is no flights found on your journey dates.

USER: Its ok, thank you for your information.

ASSISTANT: Thanks for communicating us.