Answer:
Prose is the textual exercise of setting down in written words ideas, arguments, and, often, a spatial and narrative temporality in the form of discourse. As such, it is highly structured and cemented in coherence and congruity. A conversation, on the other hand, may have all of the factors above, but its delivery doesn´t need to be, a fortiori, structured like a prose discourse. A conversation is more spontaneous and its boundaries are less well defined.