Why would that matter? If it comes up again next week, the person will get the same message. If I have a one-time interaction with you, all I need to know is that you're out today and back Monday.
For example, if I need X done by Friday, and I know Y company doesn't work on Fridays, I have a better idea of how much workload there is per day. It saves me from sending another email asking "hey, I know you weren't here on Friday, but is that every Friday or a one-time thing? And does that affect Joe from marketing and Sally from DevOps, or is it just you?"
