You can add required words to a response from the Chat Logs page under Admin.
A required word is a word that is required to be in the question for a specific response.
Question: Do you like hockey?
Answer: Yes, I like hockey.
In general the bot will automatically match similar questions to find the best response. A required word can be used to ensure the bot does not choose a response if the required word is missing from the question.
Question: Do you play hockey?
This question would normally be matched to the similar question, but because it is missing the required word "like", it will not be considered as a match.