You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to attend a Tennis competition in Las Vegas LAS from Dallas DFW. Can you find a flight for me?

ASSISTANT: Please share your trip dates.

USER: Ok, my journey dates are on May 27 and return on May 29.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connecting flight to travel.

ASSISTANT: Can I know your preferable timings?

USER: No, but I need a business class.

ASSISTANT: May I know your name?

USER: Yes, I am Richard Collins.

ASSISTANT: There are no flights available on your routes.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.