Use this expected response when the bot message has sent a button, carousel with buttons or media with a button that the chatbot user needs to press to continue the conversation. If the chatbot user types a reply instead of pressing a button, the chatbot automatically re-prompts them to press a button, unless their reply matches one of the buttons.
You can configure the number of times the chatbot should re-prompt the chatbot user in the chatbot experience settings, and how the chatbot should respond if the chatbot user still types a response after reprompting.
If you want to perform an action after the chatbot user presses the button like saving a value to a variable, configure button in the bot message.