Hello, this is Sam speaking.
你好，我是萨姆。
Hello, Sam. This is Tina.
萨姆，你好，我是蒂娜。
Hi, Tina. Is Bobby there?
蒂娜，你好，博比在吗？
No. He's at school.
不，他在学校。
It's Sunday today. We don't have any lessons on Sunday.
今天是星期日，我们在星期日不上课。
This is Bobby. Ha! Ha!
我是博比，哈！哈！