You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I want to attend my business meeting, could you book my ticket from BOS to ORD?

ASSISTANT: May I know your travelling dates?

USER: My itinerary dates are Aug 16 and 18.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Any more requirements?

USER: I want to depart from Boston in the afternoon.

ASSISTANT: Can you help me with your name?

USER: Shirley Hall here.

ASSISTANT: Frontier Airlines providing connecting flight in the economy class with fare 100, shall I proceed for booking?

USER: I prefer to travel in business class.

ASSISTANT: Ok, I will check with your required class, please be on hold.

USER: Sure.

ASSISTANT: Sorry, no flight found with your preferred class.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.