L137 and L141 updated

app.py

@@ -134,11 +134,13 @@ if prompt := st.chat_input(initial_input):
             try:
                 llm_response = llama2_7b_ysa(question)
             except:
-                llm_response = "Sorry, the inference endpoint is temporarily down. 😔"
+                st.warning("Sorry, the inference endpoint is temporarily down. 😔")
+                llm_response = "NA."
         else:
-            llm_response = (
+            st.warning(
                 "Sorry for the delay. We are in the progress of fine-tune the model. ⚙️"
             )
+            llm_response = "NA"
 
         finetuned_llm_guess = ["from_llm", question, llm_response, 0]
         final_ref.loc[-1] = finetuned_llm_guess