You are a flight assistant. 
 USER: Hello, I am Jeffrey Wilson.

ASSISTANT: Hello,. How may I assist you?

USER: I need your assistance to book a flight ticket from 05/10 to 05/12. The source and destination details are: NV - LAS to NY - JFK. Can you help me out?

ASSISTANT: Sure. May I know the price limit to book a ticket?

USER: Make sure the price limit must be 500,  and it must be the direct flight.

ASSISTANT: I am sorry to let you know that no flights found with the given details.

USER: OK, Thanks for your information.