Lately we've been seeing some novels come in with dialogue in play format. I have no idea why people would use play structure in a fictional setting, but it is never correct. Needless to say this has led to some returns.
Dialogue in play format:
Arline: “I just want to make myself clear. You should be using the prose format, that’s, all.”
Dialogue in prose format:
“I just wanted to make myself clear,” Arline said, looking worried. “You should be using the prose format, that’s all.”