Update app.py

app.py

@@ -5,6 +5,7 @@ from composio_llamaindex import ComposioToolSet, App, Action
 from llama_index.core.agent import FunctionCallingAgentWorker
 from llama_index.core.llms import ChatMessage
 from llama_index.llms.openai import OpenAI
+from llama_index.llms.gemini import Gemini
 from dotenv import load_dotenv
 import gradio as gr
 import os
@@ -36,7 +37,7 @@ class APIResponse:
 class CalendarService:
     def __init__(self):
         self.toolset = ComposioToolSet(api_key=os.getenv('COMPOSIO_API_KEY'))
-        self.llm = OpenAI(model="gpt-4", api_key=os.getenv('OPENAI_API_KEY'))
+        self.llm = Gemini(model="models/gemini-2.0-flash", api_key=os.getenv('GOOGLE_API_KEY'))
         self.connections: Dict[str, Dict[str, Any]] = {}
         
     def initiate_connection(self, entity_id: str, redirect_url: Optional[str] = None) -> APIResponse: