简单问候语Hello/Goodbye — 英语情景题

情景对话：放学后，Sam 在校门口遇见了刚下班的妈妈，两人简短交谈后，Sam 要去上钢琴课，与妈妈道别。请补全对话（每空一词）。Sam: Good afternoon, Mum! Mum: Good (1)________, Sam! Sam: Is it time to go home? Mum: Yes. Let's go. Sam: Wait! My piano lesson starts at four. Goodbye, Mum! Mum: (2)________, Sam! See you after the lesson.