SLA settings

Hello everyone so I have for some weeks ago installed ME SD+ and I find it pleasing. But now after some test runs I need to start to set up SLA's. And the support organization that I work for have a lot of needs to send a reply to requesters every 4 hour.

So I have set up 4 levels, Low, Medium, Hight and Outside-SLA.

So what I want to do with my High SLA is to set that requester get a update every 4 hour from the system just replying some standard template thing, but this function seems to be missing? Or am I doing wrong? Do anyone know if it is possible to make the system to send email in this way? Or is the only solution to notify the technicians and let them do this work?

Thanks for any help in this matter.