Customer is asking for local delivery after checkout with shipping, how to edit order to reflect

The customer checked out with free economy shipping, realized that we were local, and asked if I can do local delivery. I went into my settings and added local delivery as an option for my zip code, but of course they’d already checked out. Now on their order, there’s the option to mark it fulfilled and of course create shipping label. I’d really prefer to just do the local delivery but don’t know how to bypass purchasing a shipping label. Any help would be appreciated.