职场英文拒绝额外加班，怎么说礼貌又得体？

地道表达："I appreciate you thinking of me for this task, but I have a prior personal commitment this evening that I can't reschedule. Would we be able to tackle this first thing tomorrow morning?"，翻译：感谢你想到让我负责这个任务，但我今晚已经有无法改期的私人安排了，我们明早第一件事处理可以吗？使用场景：委婉拒绝非紧急的临时加班，既表明立场又留有余地。例句就是完整常用表达。