Lindy has released CC-based scheduling, allowing users to hand an email thread to the assistant by adding its email address on the CC line.
It can read the thread, book the meeting if both sides have already agreed on a time, or reply once with three open slots if they have not.
Constraints can simply be written in the thread, such as “mornings only” or “keep it under 30 minutes”, and are read and respected.
The invite gets sent out, and the meeting is added to the calendar.