You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to book a flight ticket from OAK to DFW, Can you please help me for booking?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: I would like to travel on 02/16 to return on 02/18.

ASSISTANT: May I know with your name please?

USER: Amanda Smith.

ASSISTANT: Do you need a break in your journey?

USER: I need a connecting flight.

ASSISTANT: Please help me with your preferred class to fly.

USER: I need a business class.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Amanda Smith, I am really sorry to inform you that there are no flights available for you journey.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us. Have a great time.