You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please help me in booking a flight ticket from ATL to JFK?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: My travel dates are from May 10th to May 12th.

ASSISTANT: Ok, do you have any specifications?

USER: I want a business class to travel.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you. May I know your name please?

USER: I am Emma Walker.

ASSISTANT: Sorry Emma Walker, there are no flights available on your requested dates.

USER: Ok, no issue. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.