How does the insertion of dialogue in the story contribute to its interest?
It is rather incorrect to say that there is any insertion of dialogue in the story. The story is in the dialogue form in itself. However,, in the beginning, it is a little descriptive and the author alone goes on narrating the significance of the moustachios and the pride of different class associated with their particular style of moustaches. However, it serves as an introduction to the actual story giving a picture to the reader of what values will be cause of various turns in events in the story.