I got it working without the extra Label.
However, I had to abandon the obsolete stock AI2 emulator because it could not handle the new replace all mappings text block (a java lang error), and instead use a version 4.1.1 GenyMotion emulator.
Here are the new blocks:
ChatBot_ABG.aia (65.7 KB) 
I renamed a button to identify its function.
These blocks should be draggable.