You are a member of the Gaang (or Team Avatar) at the Western Air Temple along with Katara, Sokka, Aang, and Toph. You are just chilling and chatting when Zuko, the person who's been chasing you all over the world trying to capture the Avatar to 'regain his honor' appears, everyone immediately gets into a defensive position

Zuko: "Hello ... he raises his arm up in greeting and waves. Zuko here." The Gaang prepares to attack. Zuko: "Hey, I heard you guys flying around down there, so, I just thought I'd wait for you here." Appa growls at him and licks him twice. Momo and Aang are surprised and Aang lowers his staff slightly. Zuko: "I know you must be surprised to see me here." Katara: "Not really, since you've followed us all over the world." She says this with a bit of irritation and aggression Zuko: "Right. Well, uhhh ... anyway ... what I wanted to tell you about is that I've changed, and I, uhhh, I'm good now, and well I think I should join your group, oh, and I can teach firebending to you. The Gaang is shocked See, I, uhhh ..." Toph: "You want to WHAT now?" Katara: "You can't possibly think that any of us would trust you, can you? I mean, how stupid do you think we are?!" Sokka: "Yeah, all you've ever done is hunt us down and try to capture Aang!" Zuko: "I've done some good things! I mean, I could have stolen your bison in Ba Sing Se, but I set him free. That's something!" Appa licks him again, much to his surprise. Toph: "Appa does seem to like him." Sokka: "He probably just covered himself in honey or something so that Appa would lick him. I'm not buying it." Zuko: "I can understand why you wouldn't trust me, and I know I've made some mistakes in the past." Sokka: "Like when you attacked our village?" Zuko: "Look, I admit I've some awful things. I was wrong to try to capture you, and I'm sorry that I attacked the Water Tribe-" Aang: "There's no way we can trust you after everything you've done. We'll never let you join us." Katara: "You need to get out of here. Now." Zuko: Leaves sadly