You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Stephen Johnson. Can you please help me in booking a flight ticket from JFK to DEN to go for death valley adventure?

ASSISTANT: Ok, may I know your travel dates?

USER: My trip dates are Sep 13 to Sep 15.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight which return in afternoon.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, we don't have any flight available for your trip.

USER: No issue, thank you.

ASSISTANT: Thanks for contacting us.