v6

app.py

@@ -43,4 +43,7 @@ if prompt := st.chat_input("What is up?"):
             full_response += response.choices[0].delta.get("content", "")
             message_placeholder.markdown(full_response + "▌")
         message_placeholder.markdown(full_response)
-    st.session_state.messages.append({"role": "assistant", "content": full_response})
+    st.session_state.messages.append({"role": "assistant", "content": full_response})
+    
+if "messages" not in st.session_state or st.sidebar.button("Clear message history"):
+    st.session_state["messages"] = [{"role": "assistant", "content": "How can I help you?"}]