Update app.py

app.py

@@ -144,11 +144,13 @@ if prompt := st.chat_input("How can I help you today?"):
     with st.chat_message("user"):
         st.markdown(prompt)
     with st.chat_message("assistant"):
-        message_placeholder = st.empty()
-        full_response = ""
-        message_history = "\n".join(list(get_message_history())[-3:])
-        result = qa_chain(prompt)
-        output = [result['result']]
+        with st.spinner(text="Looking for relevant answer"):
+
+            message_placeholder = st.empty()
+            full_response = ""
+            message_history = "\n".join(list(get_message_history())[-3:])
+            result = qa_chain(prompt)
+            output = [result['result']]
 
     def generate_pdf():
         page_number = int(result['source_documents'][0].metadata['page'])