You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a flight ticket under normal cost?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My airport codes are JFK and BOS.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Aug 19 and Aug 21.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I want a ticket in business class.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Jerry Smith.

ASSISTANT: We found an AA airline, flight number: 1023, class: business, price: 700 with one connection.

USER: Please proceed with booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.