Basic Grammer, with Alayosho!
Whenever a new person begins speaking, you separate them with a paragraph change. Even if Joe, the Yesman, only says "Yes Boss". Ex.:
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Boss preforms action, then says, "I am monolouging!" There is more text here to describe things like how he said his monolouge, and maybe some actions preformed during speech,
"Yes Boss" Joe Said. (The full line. Joe is two dimensional, unimportant, and no one cares about him. Even with such a bland line, the paragraph has to change.)
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One way to make unimportant speech, without breaking the paragraph, is to place it with the speaker's line. Ex.:
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Boss makes an action, "Speaking!" pretty words here, and his Yesman, Joe, voiced his agreement (In this example, Joe is so amazingly unimportant that we cant even honor his lame ass with a dialogue change. his "yes" isn't even voiced, its just acknowledged that he said it in response to an actual character's actions.)
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The later example should be used sparingly and is more of a time when everyone already knows what is going to be said, and could guess "Of course Joe said yes". While any actual character, like Bill From Acounting, speaking up, should get their own line. If you lump a handful of Character's that are important with a group of crappy ones, you can do something like "They said yes, even Bill From Accounting and Sally, the receptionist"
I gazed up at the sable-haired maiden with eyes so full of warmth it appeared she was crying silently. My trecherous mouth opened, "Why do you look so troubled, Princess?"
Slowly, she moved her eyes from the moon to me. She studied my imperfections before her for what seemed to be a blissful eternity before gracing me with her voice, "I've slain this land's only prince. What use, now, is a princess?"
As the maiden left my presence, so too did my heart.