Update app.py

app.py

@@ -45,7 +45,7 @@ def calculate_cost_wrapper(inputs=None):
         stats_df.loc["total"] = stats_df.sum()
         response = stats_df.to_markdown()
     except ValueError:
-        response = "No costing incurred yet"
+        response = "No cost incurred yet"
     st.session_state.messages.append(("/cost", response, ""))
     return response
 
@@ -60,7 +60,7 @@ def download_conversation_wrapper(inputs=None):
             ),
             "document_snippets": (
                 st.session_state.index.to_list()
-                if "headers" in st.session_state
+                if "index" in st.session_state
                 else []
             ),
             "conversation": [