Members changing membership from paid to free, prompt to cancel?

When our members have a paid membership and are changing to a free membership, they are not cancelling their paid membership first. It would be handy to have the system recognize the change and auto-cancel the paid membership on their last paid day and auto-start the new free membership once that time is up. 

If they want to move to the free membership immediately, it would also be beneficial to have a pop up that tells them they are cancelling their paid membership before the paid through date and that they recognize they are doing so (without any refund or proration)