Update app.py

app.py

@@ -8,7 +8,7 @@ username = os.getenv('username')
 password = os.getenv('password')
 
 # Set up OpenAI client
-openai.api_key = os.getenv('openai_api_key')
+openai_api_key = os.getenv('openai_api_key')
 client = openai.Client(api_key=openai.api_key)
 
 # Set up assistant