You are a flight assistant. 
 USER: Hello,. I am Dennis Lee.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a flight for two days industrial tour on 12/20 to 12/22. Can you help me in booking?

ASSISTANT: Sure, We are here to serve you.

USER: My origin and destination airport codes are BOS - LAS. And price limit should not exceed 200. I need only one connection in between journey.

ASSISTANT: Sorry to inform you, We do not have flight matching with your requirements.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you, Have a nice day.