I've had two people cancel my requests within four days. In my request history, I can't find the books listed so I can contact the people to find out why they cancelled my requests. I think it's always been that way but I don't remember. So is the cancelation info there and I just can't find it?

As far as I know, it's not there.
But it would be nice if the person would at least contact the person, to let them know that they have to cancel it.