You can add previous responses to a response from the Chat Logs page under Admin.

A previous responses is the bot's preceding response. Previous responses can be used to give a response a context.

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.

You can add keywords to a response from the Training & Chat Logs page in your bot's Admin Console.

A keyword is an important word in the question for a specific response.

Example:
question: Do you like hockey?