As of version 18.104.22.168, you can put synonyms in your outputs. This will make it easier to add variety to your outputs. Here's how to do it:
First, create a synonym with several phrases. For example:
Synonym Name: Hello
Save your synonym file, and include it as a resource file in a KnowledgeBase.
Now, in your KnowledgeBase you can create a rule like:
Output: (Hello). What's your name?
Here we used the same synonym in the input and output, but that's not required. The user might say "Hi", and the Verbot could reply with "Hiya. What's your name?" or "Hi. What's your name?".