You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Dec 06 and Dec 08.

ASSISTANT: Do you have any preferences?

USER: I need single connecting flight.

ASSISTANT: May I know your source airport code?

USER: My source airport code is JFK.

ASSISTANT: Is there any other preferences?

USER: I want to travel in business class.

ASSISTANT: May I know your name?

USER: My name is Larry Gonzalez.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you.