@Paolo970, @Branka-and-Silvia0,
The host may not have canceled the reservation, because of fear having a cancellation on their account. The period ended last month that allowed hosts to cancel reservations without a penalty.
@Paolo970 when you didn't receive a response from the host after two days, you should have contacted Airbnb Customer Service to request assistance with rescheduling the stay. Also, make sure that you always use Airbnb's message system whenever you communicate with hosts so Airbnb can see the correspondence.