You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to attend my business meeting, so please book my ticket from LAS to EWR.

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My itinerary dates are Aug 12 and Aug 14.

ASSISTANT: Do you have any preferences?

USER: I prefer business class in a connecting flight.

ASSISTANT: May I know your name?

USER: Eric Wright here.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: No problem, thank you.

ASSISTANT: You are welcome, have a nice day.