Update app.py

app.py

@@ -268,7 +268,7 @@ def generate_response():
     for message in messages:
         if message.get("from") == "assistant":
             message_tokens = get_message_tokens(model=model, role="bot", content=message.get("content", ""))
-        else if message.get("from") == "system":
+        elif message.get("from") == "system":
             message_tokens = get_message_tokens(model=model, role="system", content=message.get("content", ""))
         else:
             message_tokens = get_message_tokens(model=model, role="user", content=message.get("content", ""))