Answer:
a brief exchange that helps clarify the story’s themes
a few lines that suggest character traits
Step-by-step explanation:
Flash fiction is a type or genre of fiction in which the story narrated are very short and concise and can be as brief as a few words. In this type of fiction, character development is rare as events are narrated quickly and straight to the point
Therefore, the uses of dialogue tree that work well for flash fiction are a brief exchange that helps clarify the story’s themes and a few lines that suggest character traits