Canceling a Non-Refundable reservation on booking.com

They have to request it, and then you have to go to booking.com website under the inbox and you will see a message on the guest chat to agree to refund full amount

The point is I don’t want to issue a refund.

Update:

I called booking.com support, got transferred twice, then had to wait for a call back which ended up being the same guy I already talked to, then he called the guest to verify. That’s how I got a cancellation without refund. 
During those calls I had to go through all the “are you sure you can’t make an exception and issue the refund?” questions multiple times. What a pain of a process for cancelling something clearly labeled “non-refundable”.

On the same message you can decline the request to refund

As you can see in my screenshot that was not a provided option. It had to go through support.

Got it. So that is on the messages; then, yes, you will have to go through support. Booking.com sucks. I really, really hope they get their act together so we can finally have a proper competitor to Airbnb, and they bring prices down to 10% fees.