You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Brenda Adams here. I want to travel for a round trip from DEN to DEN, can you please help me with that?

ASSISTANT: Sure, can you please share your travel dates?

USER: The travel dates are from 12/25 to 12/27.

ASSISTANT: Let me check for the availability of flight.

USER: I need a direct flight.

ASSISTANT: Brenda, I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for contacting us.