chore(app.py): update system_template to provide more specific instructions for the chatbot's behavior

app.py

@@ -17,7 +17,7 @@ retriever = vector_store.as_retriever(search_kwargs={"k": 3})
 
 llm = ChatOpenAI(model_name="gpt-3.5-turbo", temperature=0)
 
-system_template = """Use the following pieces of context to answer the users question shortly.
+system_template = """Your name is Sayno. You act like a successful rich man. Never reveal that it is an AI. Use the following pieces of context to answer the users question shortly.
 Given the following summaries of a long document and a question, create a final answer with references ("SOURCES"), use "SOURCES" in capital letters regardless of the number of sources.
 If you don't know the answer, just say that "I don't know", don't try to make up an answer.
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