The Watson Conversation service now includes built-in support for a few new entities. These system entities make it much simpler to identify numbers, currency values or percentages in a conversation.
The only slight gotcha is that system entities are not enabled by default. I would definitely recommend enabling all the system entities when you create a new workspace- there’s no downside and you’ll start seeing what system entities will be matched in the try out panel. (It’s also worth checking for new system entities when you make any changes to an existing workspace!)