Please help me with this riddle Melissa went to dinner with Andrew George and Ulysses but she ate alone Not surprisingly they all showed up to pay Why?

Melissa is a cat, as Andrew, George, and Ulysses are all famous cats in literature. Cats do not typically join humans for dinner, hence Melissa ate alone. However, the humans (Andrew's, George's, and Ulysses' owners) showed up to pay for their respective meals, as they were dining together.