Link to ‘Corinthian white’ a cultivar of flowering peach (Prunus persica). http://www.learn2grow.com/plants/prunus-persica-corinthian-white-pp11493-images-large-140217/

There are not enough detail to help narrow down further. For now I could only speculate this maybe an ornamental flowering tree in the peach (Prunus persica), or Japanese apricot/Chinese plum (Prunus mume). Maybe you could give us photos i.e. buds & flower position on the branch, close up of leaves if there are any. Check out these included links for pictures of these flowers. Click on images to enlarge. Best wishes! Link to a cultivar of Japanese flowering plum (Prunus mume) https://jcra.ncsu.edu/resources/photographs/plants-results.php?serial=108784