Automating Response Time SLA

Automating Response Time SLA

Has anyone figured out how to configure a script or business rule to meet the response time SLA? I am trying to define a workflow which allows the response time SLA to be met when a ticket is assigned to a technician. I do not want the technician to have to manually add a note and check the "consider this note as first response" checkbox for the SLA to be met.

Thanks for any advice!