You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am Kenneth Scott. I want to go to Las Vegas, I heard that there is a spring season from 03/18 to 03/20. Can you book a flight ticket for me?

ASSISTANT: Sure, please provide me complete details of journey.

USER: My airport codes are DTW - LAS, price limit 1000 with direct connecting flight.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no flights found with your given details.

USER: Ok, Thanks for your service and information.

ASSISTANT: Thank you for choosing us.