I do not consider it a take out service. It is just Common sense they pay us for snacks and lunch so, I think the child has rights to ask their snack. Unless that day you do not charge for it. Try keep in your fridge few yogurts and few crackers just something easy to reach. That won't hurt. Or half apple or banana and crackers. You're a mom just think how would you feel if it is you who has to go somewhere early and your child is unhappy or hungry. It is a partnership we do need to help each other. You help the parents and they will help you. Kindness is always welcomed. I had cases that parents after all will show up with a big box of fish crackers as a thank you or a bag of fruit just because a generous gesture. If we show kindness to our children they will learn from it.: