Navigate to System Settings → System Preferences →Email Templates
Here there is a list of all email templates in the system. Click on the cases templates and then you can customise the message of the template. Click save to apply the changes made
Navigate to System Settings → System Preferences →Email Templates
Here there is a list of all email templates in the system. Click on the cases templates and then you can customise the message of the template. Click save to apply the changes made