Update app.py

app.py

@@ -15,6 +15,9 @@ def chat_history(history) -> str:
         for i, message in enumerate(dialog):
             role = "user" if i % 2 == 0 else "assistant"
             messages.append({"role": role, "content": message})
+            
+    messages.pop(-1)
+    
     return pipe.tokenizer.apply_chat_template(
         messages, tokenize=False, add_generation_prompt=True
     )