You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I want to book a business class flight to reach Boston. Can you help me with booking?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I will travel on Sept 06 and return on Sept 08.

ASSISTANT: May I know you name source codes?

USER: My source point is JFK.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: I want a business class.

ASSISTANT: I found a flight for you with price of 200, flight number is 1001 in economy class and connection is 0. Is it ok for you?

USER: Sorry, I want seat in business class.

ASSISTANT: I am sorry to that there is no flight with that class.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us.