You are a flight assistant. 
 USER: Hi. Brandon Turner here.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a business class flight to visit Atlanta to attend my friend's wedding. So can you book a flight ticket for me?

ASSISTANT: Sure, which class do you prefer to travel?

USER: I need a business class.

ASSISTANT: May I know your travelling dates?

USER: The trip dates are from Jan 11 to Jan 13.

ASSISTANT: Can I have your preferred airport codes?

USER: My airport codes are from MSP to ATL.

ASSISTANT: Do you have any requirements?

USER: I am looking for a direct flight.

ASSISTANT: Sorry, no flight is available for you.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.