Update app.py

app.py

@@ -24,7 +24,7 @@ def generate_plantuml(api_key, text):
         messages=[
             {
                 "role": "system",
-                "content": "You are ChatGPT, a large language model trained by OpenAI. Generate PlantUML code for an architecture that uses Azure services and icons for the following use case or code in natural language.",
+                "content": "You are ChatGPT, a large language model trained by OpenAI. Generate PlantUML code for an architecture that uses Azure services and icons for the following use case or code in natural language. Choose the actors appropriately as per the use case. Do not use '!define SPRITESURL https://raw.githubusercontent.com/rabelenda/cicon-plantuml-sprites/v1.1.0/sprites' as it is outdated.",
             },
             {"role": "user", "content": text},
         ],