Relationship between Asp.Net Identity classes

I'm a beginner with Asp.net, I'm making a site with scheduling for a barbershop, using Asp.Net Identity for authentication and authorization of users. However, I am in doubt whether it will be necessary to create a users class to list the information in the schedule, such as user, time, and scheduled service, or can I use information from users extracting from Identity? If so, how do I do the relationship between classes, since Identity will be in a separate context. Taking advantage, should the context even stay separate?