convert string to lower

app.py

@@ -54,7 +54,7 @@ if prompt := st.chat_input("What is up?"):
     # Display assistant response in chat message container
     with st.chat_message("assistant"):
         # with st.spinner("Thinking..."):
-        if prompt in ["hi", "hello", "hey", "/start"]:
+        if prompt.lower() in ["hi", "hello", "hey", "/start"]:
             data = library.startMessage()
         elif st.session_state['app_state'] == 'welcome' :    
             data = library.login_or_register(prompt)