Why does Socrates appeal to diotima?

Socrates appeals to Diotima in Plato's "Symposium" because she is portrayed as a wise and knowledgeable priestess of love. He seeks her guidance and teachings on the nature of love and how it can lead to the ultimate good and the pursuit of wisdom. Diotima's insights and teachings shape the dialogue on love and serve as a powerful influence on Socrates' philosophy.