To start, we can take a look at the requirements that a great chatbot must fulfill to ensure the success of the service it provides. The following list mentions some key elements of chatbot design that we must keep in mind:

• Guarantee minimum manual effort by the user: This represents the starting point in the design of a chatbot. For the success of the service, it is essential that the user is accompanied in their choices by minimizing manual intervention. This is achieved by drastically reducing the number of touches, keystrokes, or mouse clicks required to help the bot determine the best solution to the problem. To do this, you need to ensure that most of the options are provided by the same chatbot, with the user simply having to select the right option. In this way, considerable time savings are achieved in the interaction between user and chatbot.
• Predict the right options: To make sure that the system displays only the options related to that context, the right options must be provided through a series of choices. To achieve this, the system must be able to identify the user's needs. User needs must be identified with the least number of questions and manual efforts by users.
• Customization of the chatbot: This is the possibility to construct a different user chatbot interaction depending on the characteristics of the user of the service. For example, it is possible to make the system memorize user profiles, previous interactions, the interactions of other users in the system, the current context and environmental know-how. Each of these attributes must be understood together with others to truly understand users and what they may need now.