You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a ticket from CLT to EWR. Could you book a ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: Depart date is June, 9 and return by June, 11.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I would prefer direct flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: My name is Ruth Lee.

ASSISTANT: Are there any other specifications?

USER: I prefer business class.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Thank you.

ASSISTANT: Thank you for choosing us.