Livechat - fill the offline form

How i can pre-fill ‘offline’ form fields ?!

I’m using:

      this.setGuestName('${usuario.nome}');
      this.setGuestEmail('${usuario.email}');

and

       this.registerGuest({
               name: '${usuario.nome}',
               email: '${usuario.email}',
               token: '${usuario.id}',
               department : 'Atendimento'
           });

The user is already logged in and I have all information about him. In the flow where the department is online, it works well. But when you’re offline, not works;