one company trainee has been late for very important meetings 3 times already. The company does not have any strict rules on "time in and time out" but values punctuality especially during meetings....

one company trainee has been late for very important meetings 3 times already. The company does not have any strict rules on "time in and time out" but values punctuality especially during meetings. How should the company deal with this employee and what should they do to address this issue.