Hey! Welcome to the board! I betcha Mauro would know the answer to your question, or any of the other well-versed orchidophiles on this board
Stick around, there is lots to learn! Oh, and about your dend...if it has a cane-like structure that the leaves are growing on, its ok if it drops some leaves, they do that this time of year. Mine did that too, and we're essentially in the same climate area, so it should be the same reason. Just keep it in a medium light area (east or west window or south if its somewhat filtered) and don't overwater