In a working fiction, he best place to look for supporting details that indicate the theme of fiction is in dialogues and descriptions.
A dialogue is a literary technique in which writers use two or more characters participating in conversation with one another. In literature, it is a conversational passage, or a spoken or written exchange of conversation in a group, or between two persons directed towards a particular subject.
Description is one of the three core elements in fiction, as well as narrative and dialogue, which brings your story to life. Description gives way to a vivid picture for the reader, it allows them to imagine all what the author tells in his story.