add converstation limit

app.py

@@ -54,7 +54,7 @@ s3 = boto3.client('s3')
 transcribe = boto3.client('transcribe')
 
 
-memory = ConversationSummaryBufferMemory(llm=ChatOpenAI(), max_token_limit=2048)
+memory = ConversationSummaryBufferMemory(llm=ChatOpenAI(), max_token_limit=2048, k=3)
 conversation = ConversationChain(
     llm=OpenAI(streaming=True, callbacks=[StreamingStdOutCallbackHandler()], max_tokens=2048, temperature=0.5), 
     memory=memory,