In prose yes. However there is a structure to dialoge, that is hard to miss, you also have indentations, sections and chapters. Many books have lists for example, but it is usually not prose.
In some types of Lisp programming (such as Emacs lisp), it is common to use Form–Feed characters as chapter breaks within a file. Alas, some newer languages like Rust really don’t like that.
Like prose? Books have not many symbols nor syntax highlighting. You have to read the actual words to know what it's talking about.