根据对话内容,判断正误。
Betty: (Knocking(敲)at the door)
Mr Hart: Who is it? Go and see, Meimei.
Han Mei: Oh, it's you, Betty. Glad to see you.
Betty: Hi, Han Mei. Glad to see you, too. Is everyone in?
Hart Mei: Yes. We are all here. Come in, please.
Betty: Thank you.