You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: Can you please book a ticket from ATL to MSP? As I need to attend a wedding.

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: Sure, my planned departure and return travel dates are 11th and 13th of May.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to travel in business class in a single connected flight.

ASSISTANT: May I know your name for the booking purpose?

USER: My name is Donna Green.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey details.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.