You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a ticket from OAK to DFW to attend Science festival. Can you please help me for booking?

ASSISTANT: Sure, please mention your trip dates.

USER: My journey dates are Nov 19 and Nov 21.

ASSISTANT: Do you prefer either connecting or direct flight?

USER: I want single connected flight.

ASSISTANT: Is there any time concern?

USER: My depart time is evening.

ASSISTANT: Are there any other specifications?

USER: I prefer business class.

ASSISTANT: Can you please share your good name to proceed further?

USER: Sure, I am Raymond Gonzalez.

ASSISTANT: Please be on hold. I will check and revert you.

USER: Ok.

ASSISTANT: Thanks for your time, there are no flights found on your specified travel dates.

USER: Ok, Thank you.

ASSISTANT: Thank you for availing us.