Answer :
Based on the scenario above, it is best that you talk to your retail associate regarding about his schedule for lunch and that you should also explain as to why it is important that he should follow the rules and the schedule. If he insist that he wanted to take his lunch even if it isn't his schedule yet and you can't convince him to listen, it is best to let him take his lunch first and to cover your department because it is not good to leave the department or your section to be unattended.