The dialogue that best helps develop both characters for readers is:
“We’re going to have so much fun,” Sadie said. “I bet we’ll get to meet the band. I bet we’ll even get to hang out with them!”
“We probably won’t even get to go,” Marco said. “I bet the whole show will get canceled and we’ll have a terrible day.”
This exchange clearly showcases Sadie’s optimistic nature as she eagerly anticipates a fantastic experience and hopes for the best outcome. In contrast, Marco's reply encapsulates his skeptical and brooding demeanor, illustrating his tendency to anticipate negative outcomes. The stark contrast in their attitudes effectively highlights their personalities and their dynamic as friends.