Add slots to a dialog node to gather multiple pieces of information from a user within that node. Slots collect information at the users’ pace. Details they provide upfront are saved, and the bot asks only for the details they do not.
You can think of slots as the chat bot version of a web form in which users must fill out required fields before they can submit the form. Similarly, slots prevent the flow of conversation from moving on to a new subject until the required values are provided.