What do you call a waiter running errands?

If you call the waiter, you can say thank you. My customers, I love them. It is snowing heavily outside now, and the weather is very bad. As long as you place an order, I will deliver it to your door and let you feel our caring service. Now you can enjoy our service without leaving home. Please place an order quickly and give us a chance to enjoy our unique service. There are also free help, especially running errands for unrelated people. I often say it's useless, just like a volunteer. Don't accept any form of reward or hospitality from helpers. So, you can thank the errand boy by calling him.