You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I need to book a ticket from DFW to SFO. Could you book a ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Travel dates are from Dec, 7 to Dec, 9.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I would prefer direct flight.

ASSISTANT: Do you have any class preferences?

USER: I would like to prefer business class.

ASSISTANT: Do you have any other requirements that your are looking for?

USER: I would like to return in the morning.

ASSISTANT: Can you please provide your name to proceed further?

USER: My name is Raymond White.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Thank you.