Of course there’s dialogue in your book. How else will your characters communicate? Many ways, right?
A bouquet of red roses doesn’t need words. How about a glass of water tossed in someone’s face? A slammed door. An unanswered phone. A light left burning.
How might your character communicate with someone else – without saying one word? What might this latte mean if offered to a lover? How about if were offered to a stranger?