You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you today?

USER: I am David Roberts. I have a Business conference in Minneapolis, could you please book a flight ticket for me.

ASSISTANT: Sure, Can u send me your details?

USER: I want starts from Washington, DC-DCA on 09/23 and Return from Minneapolis St. Paul, MN-MSP on 09/25. Flight Fair should be do not exceed 1000 and direct connecting flight.

ASSISTANT: OK, could you please wait for a while, I will check the availability and get back to you. Sorry, there is no flight matching your preferences.

USER: OK, thank you for information.

ASSISTANT: Have a Great day.