Update app.py

app.py

@@ -88,7 +88,7 @@ def get_conversation_chain(vectorstore):
     - ConversationalRetrievalChain: An initialized conversational chain object.
     """
     try:
-        llm = ChatOpenAI(model_name="gpt-4o")
+        llm = ChatOpenAI(model_name="gpt-4o", temperature=0.5, top_p=0.5)
         memory = ConversationBufferMemory(
             memory_key="chat_history", return_messages=True
         )