A: I've come to say goodbye. 我是来跟你告别的。 B: When do you leave? 你什么时候走? A: I'm catching the 11:00 train. 我赶11:00的火车。 B: Take care of yourself and don't forget to keep in touch. 请多保重,别忘了保持联系。 A: Goodbye. Hope to see you again next year. 再见。希望明年能再见到你。