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I don't think there is any configuration for this but lets wait for experts reply on this.
as we know assignment engine checks Assignment Availability= "Yes" so may be you can design your custom workflows(escalation,filters) which will set assignment availability to No for set of users. I assume you have some field (may be Job Title on CTM:People form) which indicates that a user is trainee.
Complexity for this customization depends upon your environment. how many number of Trainee users you have and do they work in same shift or there are multiple shifts? and if multiple where you have defined there schedule.