You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I need to attend mechanical workshop, can you book a ticket from MSP to LAS?

ASSISTANT: Sure, May I know the travelling dates?

USER: I would like to depart from my location on 23rd July, I want to return back by 25th July.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any other requirements?

USER: I prefer business class ticket.

ASSISTANT: May I know your name?

USER: My name is David Jackson.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us.