Ugh, I don't like last minute messages too. The clinic staff messages me, since my T sees client's back to back, or with just a very short gap to use the bathroom, or refill her insulated water bottle.

My T forgot to tell me we'll have 1 session then a 2 week gap till our next session. Glad I emailed because a phrase she used last session triggered me, so she notified me about her upcoming break in her reply.