Strict Mode, where the input needs to exactly match one of the given rules to trigger a flow.
textevents will be sent to the NLP provider and returned either as a
payloadevent if an intent is found, or untouched if no intent is found. When an intent is found, the value of the payload will be
event._nlp_provider: contains details about the NLP provider integration
event._nlp_result: contains the raw response from the NLP provider
event.text: contains the original text input
YES_INTENTand match it without having to list all the possible ways to say "yes" in the button's