In UI Builder, activities that prompt the user for a response can be made interruptible. This means that if a user types "help" or "cancel" in a text-based chatbot—or says those commands in a voice-based chatbot—the current conversation will pause and redirect to the zammoHelpTriggered
event.
To enable this behavior, use the Allow Interruptions setting. You can find it by selecting the activity in the Design pane, then going to the Details pane. From there, open the Other tab, expand the Prompt Configurations section, and scroll to the bottom. Set Allow Interruptions to True to activate it.