Notify requester by e-mail when there is a new reply from technician

Hi there,

As the subject says.

When a requester create an incident, a technician will get notified of the new request created.
Then the technician will reply to that same email say from their Outlook.

Problem is, while the reply is added as part of the conversation of that request, the requester never gets notified AND the field [Responded Date] is not updated, which will poses a problem with regards to SLA.

When the requester reply's via email, the technician gets a notification email.
but not the other way around.

Under Admin > Organization Details > Notification Rules, there's a [Notify Technician when a new reply is received from the requester] rule but no similar rule available for requester.