diff --git a/wafl/events/conversation_events.py b/wafl/events/conversation_events.py
index fe5c1e9..d5afbb1 100644
--- a/wafl/events/conversation_events.py
+++ b/wafl/events/conversation_events.py
@@ -80,6 +80,12 @@ async def _process_query(self, text: str):
             ):
                 await self._interface.output("I don't know what to reply")
 
+            if (
+                not text_is_question
+                and not self._interface.get_utterances_list()
+            ):
+                await self._interface.output("I don't know what to reply")
+
             if (
                 not text_is_question
                 and answer.is_true()