You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: George Lewis here.

ASSISTANT: How can I help you?

USER: I would like to prefer a economy class for my business trip to Las Vegas. So can you book the flight ticket for me?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: The travel dates are from 06 Feb to 08 Feb.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: The airport codes are from DTW to LAS.

ASSISTANT: Ok, do you have any connection limit?

USER: I prefer a stopover flight.

ASSISTANT: Sorry, no flights are available on your route.

USER: Not a problem. Thank you.

ASSISTANT: Welcome, have a nice day.