[Helping people with their problems helped Aang to think about his own less. And in some cases, it helps him to work through his own problems in the process.

He really is touched by Katniss's offer. He was worried because unlike him, she might never see Sokka or Foo Foo again. She might not believe for certain the way Aang does that they'll be able to be happy. Yet still she's offering to help him instead - he doesn't know what he did to deserve this friendship.]

I know, Katniss. I'll let you know. Just like... You'll let me know if you need anything.

Thank you. You're a really good friend, Katniss.