Hi @sten.
You can enter code with three ``` before and after the code, or inline with a single ` sign.
One way of doing this is to write / collect lots of stories for these situations. Also, have a look at Forms (Forms), Knowledge Bases (Integrating Rasa with knowledge bases) and Custom Actions (Actions), as well as the new experimental Response Selector (Integrate response retrieval models in assistants built with Rasa).
Make sure to featurize your intents and slots in a good way (e.g. use the new EmbeddingPolicy (TED), which should be default by now, see Policies), so Rasa Core can learn to generalize well from fewer examples.