You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to book a ticket from OAK to DFW.

ASSISTANT: Sure, can you share me your travel dates?

USER: Travel dates are from Feb, 2 till Feb, 4.

ASSISTANT: Do you have any class preference?

USER: I would like to prefer business class.

ASSISTANT: Is there any other specifications?

USER: I prefer connecting flight.

ASSISTANT: Can I know your good name?

USER: My name is William Jackson.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Thank you.