After releasing your chatbot for a test run, there's a very high possibility that you've forgotten about a keyword here and there -- that's why it's a good idea to have a friend or two to put your chatbot through the ringer.
In Activity tab of your chatbot, you'll obviously be able to see the Unanswered messages that your chatbot didn't know how to process!
Tips: You can add your new keywords in a recipe directly via the Activity tab!
No big deal, though: the user, after typing the unanswerable message, was sent one of your messages from the Unanswered recipe.
You can choose to add the unanswered keyword to a preexisting recipe or create a specific recipe to answer the keyword in question (handy for the messages you didn’t expect, like swear words!)