Get text input in Siri

I’m trying to get Siri to read some text input from a Siri dialogue. How? I figured out speech but I’m unsure how to get input. Can I reference things said after the word to start my command like argv[n]?
Let’s say I’m trying to figure out a good text-to-speech for people who can’t talk I guess.

You simply need to use the Show Result action. See this simple example.