A new invitation arrives during time you reserved for something personal. You consider accepting because the earlier plan does not involve another person. Yet the task matters to you and has already been postponed several times.
Treat the reserved time as occupied when deciding. You can say you have a commitment without presenting a detailed account of the activity. Offer another time if you want to take part and have one available.
Decide whether to move the earlier plan
Sometimes the new request matters more and you choose to reschedule. Put the earlier task into a specific new slot before giving away its time. Check that the new slot is realistic rather than a convenient way to avoid the decision.
If your personal plans move every week, look at the requests causing the moves. You may need a different available window or a clearer response to one recurring demand. Start with the pattern you can observe in your calendar and adjust that arrangement, rather than trying to protect every future hour at once.
