You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to book flight ticket from SEA to JFK?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My planned dates are Aug 6th and Aug 8th.

ASSISTANT: Is there any class preference?

USER: I prefer to travel in business class.

ASSISTANT: Do you have any connection preference?

USER: I prefer a direct flight to reach my destination.

ASSISTANT: May I know your name please?

USER: Sure, I am Mark Lopez.

ASSISTANT: Do you have any preference?

USER: No, thank you for asking.

ASSISTANT: Mark Lopez, there are no flights available in your route.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for choosing us.