You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking the flight ticket from DEN to LAX?

ASSISTANT: Let me know your travel dates.

USER: My travel dates are Apr 3 and Apr 5.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Can I know your name?

USER: George Scott.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.