There’s really no reserve list. There’s only reserving or wait- listing. If an SA says an item is reserved for you, that means your name is attached to a particular piece expected to come to store and you are guaranteed to get it so long as the store receives the item without any issues.
They never reserve an item unless they either have the item already or saw the item listed on an upcoming shipment list and know for sure they’re getting one, and that it’s not allocated to another client.
In boutique language, they sometimes say “flagging the item for you”. This means the same as reserving; it means they confirmed the item is coming to their particular boutique and it’s reserved (saved) for you so it can not be sold to anyone else. So reserving is done piece by piece.
But if reserving is not allowed in that boutique, or the once that are coming for sure are already allocated (reserved), then some boutiques may take names down for a list (waitlist) and allocate the products they may receive by precedence until there’s no more.
PS, CC information is not necessary for reserving.