diff --git a/artifacts/tx-os/src/pages/protocol-request.tsx b/artifacts/tx-os/src/pages/protocol-request.tsx
index f8f174d7..9e508de2 100644
--- a/artifacts/tx-os/src/pages/protocol-request.tsx
+++ b/artifacts/tx-os/src/pages/protocol-request.tsx
@@ -437,7 +437,22 @@ export default function ProtocolRequestPage() {
             <Label htmlFor="room">
               القاعة <span className="text-rose-500">*</span>
             </Label>
-            <Select value={form.roomId} onValueChange={(v) => set("roomId", v)}>
+            <Select
+              value={form.roomId}
+              onValueChange={(v) =>
+                // Reset the time selection when the room changes so no stale
+                // date/slot/free-time values survive a room switch (the slot
+                // grid is per-room and slot mode itself may flip).
+                setForm((f) => ({
+                  ...f,
+                  roomId: v,
+                  date: "",
+                  slotId: "",
+                  startsAt: "",
+                  endsAt: "",
+                }))
+              }
+            >
               <SelectTrigger id="room">
                 <SelectValue
                   placeholder={
@@ -549,7 +564,36 @@ export default function ProtocolRequestPage() {
             />
           </div>
 
-          {slotMode ? (
+          {form.roomId === "" ? (
+            // No room chosen yet → we don't know whether slot mode is on, so
+            // show a hint instead of the (possibly wrong) free pickers.
+            <div className="space-y-2">
+              <Label>
+                موعد الحجز <span className="text-rose-500">*</span>
+              </Label>
+              <p className="rounded-lg border border-slate-200 bg-slate-50 px-3 py-3 text-sm text-slate-500">
+                اختر القاعة أولًا لعرض المواعيد المتاحة.
+              </p>
+            </div>
+          ) : slotProbe.isLoading ? (
+            <div className="space-y-2">
+              <Label>
+                موعد الحجز <span className="text-rose-500">*</span>
+              </Label>
+              <p className="text-sm text-slate-500">
+                جارٍ تحميل المواعيد المتاحة…
+              </p>
+            </div>
+          ) : slotProbe.isError ? (
+            <div className="space-y-2">
+              <Label>
+                موعد الحجز <span className="text-rose-500">*</span>
+              </Label>
+              <p className="text-xs text-rose-500">
+                تعذّر تحميل المواعيد، يرجى المحاولة مرة أخرى.
+              </p>
+            </div>
+          ) : slotMode ? (
             <>
               <div className="space-y-2">
                 <Label htmlFor="bookingDate">