Update app.py

app.py

@@ -77,7 +77,8 @@ st.title("(PDF) Information and Inference")
 st.markdown("Retrieval-Augmented Generation") 
 
 if 'messages' not in st.session_state:
-    st.session_state.messages = [{'role': 'assistant', "content": 'Hello! Upload a PDF or select a preloaded PDF and ask me anything about its content.'}]
+    preloaded_pdfs_list = ", ".join(PRELOADED_PDFS) if PRELOADED_PDFS else "No preloaded PDFs available"
+    st.session_state.messages = [{'role': 'assistant', "content": f'Hello! I have the following preloaded PDFs: {preloaded_pdfs_list}. You can also upload your own PDF. Once a PDF is selected or uploaded, ask me anything about its content.'}]
 
 with st.sidebar:
     st.title("Menu:")