Tough decision from Administrative point of view. I would recommend Academic counselling session for such senior resident. However, if still insisting to change, I would due to legitimate reason(s)to allow such transfer, to have fruitful outcome for both sides.more
Ask them what about IR is less appealing to them; what has deflated their interest in IR; many times a particular instructor or professor can be harder than the IR resident anticipated. Getting to the basis of their thought process regarding seeing themselves in IR often will be a key to helping them in their decision making.