You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for the day?

USER: I am planning to visit Las Vegas, can you please book me a ticket from HOU to LAS?

ASSISTANT: Sure, I am here to help you with that flight ticket booking. Can you please share your preferable travel dates?

USER: My preferable journey dates are Dec 29 and Dec 31.

ASSISTANT: May I know your name please?

USER: My name is David Scott.

ASSISTANT: Can I know your connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Do you have any other specifications?

USER: I prefer business class flight.

ASSISTANT: There are no flights found on this route as per your travel dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Most welcome, thank you for reaching us. Have a great day.