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。