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。