These are vague... are you available to train a replacement anytime, even after your last day? Are you saying you'll be too busy to help prepare someone else or that you'll be busy helping with the transition? As with everything else in your resignation letter, clear and concise are the way to go.
What Should My Letter of Resignation Say?. If you're not sure of how to write a resignation letter, that's normal __ it's certainly not an everyday task. Take a look at a sample resignation letter, or a few if you want to explore different options. In our view, the shorter the resignation letter, the better.