You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to attend a Seminar in New York. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I can help you and can I know your airport codes?

USER: My airport codes are OAK and JFK.

ASSISTANT: May I know your preferable travel dates?

USER: My travelling dates are June 10 and June 12.

ASSISTANT: Can I know your name please?

USER: My name is Lisa Lee.

ASSISTANT: Do you need any break in your flight trip?

USER: I prefer single connecting flight.

ASSISTANT: Sorry, there is no flight obtained on your travel dates to book a flight ticket.

USER: Anyway, thanks for the information.

ASSISTANT: You are most welcome and thank you for reaching us.