Update app.py

app.py

@@ -120,15 +120,27 @@ def chat(user_input, history):
 
         answer, source = get_answer(user_input)
 
-        history.append(
-            (user_input, answer + "\n\n📌 Source: " + source)
-        )
+        if not answer:
+            answer = "❌ No answer found."
+
+        if not source:
+            source = "No source available."
+
+        # ✅ NEW FORMAT (VERY IMPORTANT)
+        history.append({"role": "user", "content": user_input})
+        history.append({
+            "role": "assistant",
+            "content": answer + "\n\n📌 Source: " + source
+        })
 
         return "", history
 
     except Exception as e:
         print("CHAT ERROR:", e)
-        history.append((user_input, "⚠️ Something went wrong."))
+        history.append({
+            "role": "assistant",
+            "content": "⚠️ Something went wrong."
+        })
         return "", history