Yes you can leave note for the UPS concerning to the various aspects such as you might not be available at the particular day to receive your delivery of the package, or you may cancel the order by a way of note, you may want to receive the order at some other place and many such other changes. It may happen for the various reasons and with all of us.
You can leave a note for the UPS to bring such changes in your package, however, some of these changes are available at a payment of certain fees.
This will save you and the UPS both from the unexplained reasons, as to why you were not able to receive the package or any such other reasons and you can make certain changes to your package.