The upcoming conversation design is even more complex, with chatbots specialized for specific tasks, sometimes very short-live tasks, that best address user's needs (or NLP questions). This implies the need for the actors to pass their hand very often during the conversation. Both humans and chatbots go in and out of the conversation with the end user, exchanging the task of conversing with him to solve his problem. So it happens that, for example, a chatbot invites another and that the latter offers an option (a button, an intent or an automated action) to "go back" to talk to the previous chatbot. In the exactly the same manner it happens for humans where the first level operator switch the conversation to the technical staff who discusses with the client and moves back the conversation to the initial operator.