I have about 32000 miles that I wanted to redeem for a CDG-AKL trip next January but when I go through the booking pages to find the cost it says there is "no availability" in business class only in economy.

Is there a "magic" time when I can try and use the miles as I can't believe that there is no availability at all in January or am I misunderstanding the use of miles and only economy can be booked with miles?

Sorry if this has been asked before but I did do a search using different search words but didn't find anything.

Thanks...