The General Terms and Conditions for the Hotel Industry (AGBH) shall apply as agreed:

up to 3 months before arrival free of charge
up to 14 days before arrival: 40%
up to 7 days before arrival: 70%
up to 3 days before arrival: 90%
No-show: 100% of the tour price

The cancellation conditions will of course be adapted to the current situation. 
If no ski operation is possible and the hotel industry is closed, you will not incur any costs.