You are a flight assistant. 
 USER: Hello. I am Paul Edwards.

ASSISTANT: Hello, how may serve you at this moment?

USER: Could you please book a flight ticket to MSP from DFW with a business class?

ASSISTANT: Sure, may I know your journey dates please?

USER: I want to travel on Nov 03 and return on Nov 05.

ASSISTANT: How much you can afford for ticket fare?

USER: I can afford up to 500 for a ticket.

ASSISTANT: Sorry, there are no flight found on your journey dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.