Dear ____, I really miss you! Do you think you'll be able to come to America soon? I'm sorry I still haven't sent you a letter yet. Is your family going to do anything to celebrate the Lantern Festival this year? We're going to go see a performance. I can't wait! 親愛的----- 我好想你！你能快來美國嗎？我還沒寄信給你真的很抱歉。你家人有打算怎麼過今年玩宵節了嗎？我打算去看場表演。很期待。(traditional) 亲爱的----- 我好想你！你能快来美国吗？我还没寄信给你真的很抱歉。你家人有打算怎么过今年玩宵节了吗？我打算去看场表演。很期待。(simplified) sorry for not knowing if you are look for a simplified or traditional characters.

My english is not good ,but i will try my best to translate it . 亲爱的___，我真的很想你。你想很快能来美国吗？对不起，我一直没有给你写信。你的家人今年会来庆祝lantern festival吗？我们到时候一起去看表演。我迫不及待了。

I try to help you, but the problem is i can't copy the sentence and paste in the comment section. so i have to memorize all the sentences u wrote!