To develop both Sadie and Marco's characters through dialogue, you would want to showcase their personalities, interests, and their relationship to each other. Here's an example of how their conversation might go:
Marco: (with excitement) "Did you see this? They're coming! I can't believe it!"
Sadie: (smiling, her eyes lighting up) "I know! This is like a dream come true! We’ve been waiting for this forever!"
Marco: (leans closer, lowering his voice) "And you know your uncle can get us in early, right? We could have front-row seats!"
Sadie: (bites her lip, hesitating) "True... but what if I get too nervous to ask him? I just don't know how to bring it up."
Marco: (playfully nudges her) "Come on, Sadie! You're the queen of awkward conversations. Just tell him it’s for the best concert of the year!"
Sadie: (laughs, relaxing a little) "Okay, you have a point. But what if he says no? He can be pretty serious about his job."
Marco: (grins) "Then we’ll just go together and get general admission. Either way, we’re going! This band is our jam!"
Sadie: (nods, feeling more confident) "Alright, let's promise to at least try for the early tickets. I can’t miss this!"
Marco: (winking) "Deal! And if your uncle doesn’t help us, I'll start planning my epic karaoke performance of their greatest hits!"
This exchange highlights Sadie's enthusiasm tempered by her hesitation and self-doubt, while Marco’s playful confidence contrasts with her more reserved nature. Their shared excitement for the band establishes a common interest and shows the bond between them, setting the stage for further character development.