I resigned./I quitted my job./I've put in my notice.
我辞职了。

downsize
缩减开支；裁员；减小规模
The airline has downsized its workforce by 30%.
这家航空公司裁员30%。

A: Emily, could you spare a few minutes?
艾米丽，你能腾出几分钟吗？
B: Sure. What do you need?
没问题，你需要什么？
A: Well, I wanted to let you know that I've put in my notice.
恩，我想告诉你我辞职了。
B: Really? Why?
真的吗？为什么？
A: It's complicated. But basically it boils down to one thing. This company is downsizing and I can't continue working for a company that may let me go.
原因很复杂，不过简单说来这是迟早的事。这家公司在缩减开支，我不能等到公司解雇我我才走。
B: But surely they wouldn't fire you! You are one of the most experienced managers here.
可是，他们不可能解雇你！你是这里最资深的经理之一！
A: Well, to be honest, there's another reason. I've got a better offer.
恩，坦白说，还有一个原因，我有更好的选择了。
B: Well, that's great news. Congratulations. Where will you be located?
啊，那可是个好消息，恭喜你，你要去哪里？
A: The head office is in New York, but I'll be dealing with overseas companies and flying to this side of the world from time to time.
那家公司总部设在纽约，不过我要打理和海外公司的买卖，会经常飞回来的。
B: It'll be sad to see you go, but it sounds like you've found yourself a great opportunity.
你要走的话我会很难过。不过看来你找到更好的机会了。
A: I have. I feel lucky. I look forward to dealing with overseas companies and at the same time having a chance to use English more.
是的，我觉得很幸运，我一直希望能同海外公司做生意，并借此机会锻炼英语。
B: I'm sorry to bring this up now, but would it be possible for you to write me a letter of recommendation before you go?
我很抱歉现在向你提个要求，你在走之前可以帮我写一封推荐信吗？
A: Of course I can. In fact, if there are any other job opportunities at this new company. I'll recommend you personally.
当然可以。实际上，如果这家新公司有合适的工作机会的话，我个人会推荐你。
B: Thanks. I appreciate that.
谢谢，非常感谢。