How does your message impact your receiver? Or, in other words, what’s in it for them?
This message will impact the receiver (my boss) by having them figure out how to get the meeting ready the next day. This message also impacts them by showing that I am not someone who is a no-show, and that I tried my best under the circumstances to maintain responsibility and reliability. The message would hopefully not harm our relationship quality, which at this point is new, slightly unstable, and mostly trustworthy.