Register Account by User in ServiceDesk

Register Account by User in ServiceDesk

Do you have any ideas for the ability to register the user by himself in ServiceDesk?
Like: Register or Create Account  in Social networks..

Consider this scenario:
IT provides a service to the customer, IT has a customer account. But the customer provides that service to the consumer, the consumer uses the service, but there is still no consumer account in the ServiceDesk ! to deal with his requests...
Except for creating an account via email, Is it possible to complete a form and register in ServiceDesk?

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