You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I would like to book a ticket from ATL to OAK.

ASSISTANT: Please provide your trip dates.

USER: Depart date is Aug, 9 and return by Aug, 11.

ASSISTANT: Do you need any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you need any other specifications?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: My name is Eric Smith.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for choosing us.