Jul 28 - Update schedule page's referred time

README.md

@@ -309,8 +309,15 @@ DEMO_TIMEZONE_LABEL=Eastern Time
 
 Bookable hours default to 08:00–16:30 in 30-minute slots, weekdays, up to 90
 days ahead (`DEMO_HOUR_START`, `DEMO_HOUR_END`, `DEMO_SLOT_MINUTES`,
-`DEMO_MAX_DAYS_AHEAD`). A slot already taken by a non-cancelled request can't be
-booked twice.
+`DEMO_MAX_DAYS_AHEAD`).
+
+**Only free times are offered.** When the customer picks a date, the time
+dropdown reloads to show just that day's remaining slots — anything already
+booked disappears, so two people can't choose the same appointment. Weekends and
+out-of-range dates say why they're unavailable. If a time is taken while someone
+is still filling the form in, it drops off the list with a note when they change
+the date, and the server refuses it on submit regardless. Marking a request
+**cancelled** in the admin panel puts its slot back on offer.
 
 **Mail is best-effort:** it goes out on a background thread *after* the request
 is saved, and a failure is logged rather than shown to the visitor. With