You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. I am glad that you have contacted us. How may I assist you today?

USER: I want to attend a Seminar in San Francisco. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Please let me know with your name.

USER: My name is Anthony Roberts.

ASSISTANT: Please help me with your departure airport code.

USER: My departure airport code is ORD.

ASSISTANT: Please provide me with your planned travelling dates.

USER: My travelling dates are Mar 04 and Mar 06.

ASSISTANT: Do you need a break in your journey?

USER: I would prefer single connecting flight.

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

USER: I don't have any other preferences.

ASSISTANT: Ok, please allow me a minute.

USER: Ok.

ASSISTANT: Anthony Roberts, I am really sorry to inform you that there are no active flights available for your journey.

USER: Anyway, thanks for the information.

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