The first piece of a Rasa assistant is an NLU model. NLU stands for Natural Language Understanding, which means turning user messages into structured data. To do this with Rasa, you provide training examples that show how Rasa should understand user messages, and then train a model by showing it those examples.
Run the code cell below to see the NLU training data created by the rasa init command:
lizhe@ubuntu:~/rasa_workspace$ cat data/nlu.md