You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you help me to book a business class flight from New York?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are Jan 16 and 18.

ASSISTANT: Could you please help me with the airport codes?

USER: Suddenly I have changed my decision, So I want to board from LAS and land at JFK.

ASSISTANT: May I know your connection limit?

USER: I am ok with any connection.

ASSISTANT: Do you have any other specification that you are looking for?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: Sharon Young here.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.