You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Kenneth Carter.

ASSISTANT: How can I help you at this moment?

USER: I would like to visit Las Vegas for my project work, could you please help me to book my flight ticket from ATL to LAS?

ASSISTANT: Sure, I am here to help you. May I know your preferable journey dates for this trip?

USER: Sure, I would like to depart on Dec 4th and also please book my return ticket on Dec 6th.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need single connection.

ASSISTANT: Which class do you prefer for this trip?

USER: I prefer for a business class.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Kenneth Carter, we regret to inform you that no business class ticket is available on this route.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for utilising our service.