Goodbye in Cantonese?

I was at a Chinese restaurant, and one of the waiters waved and said something like "zoi kin" or "cho kin" while I was walking out. I couldn't really hear him, but I assumed it meant "goodbye" in Canto, so I replied with "Zai Jian" because he told me that he spoke both... show more I was at a Chinese restaurant, and one of the waiters waved and said something like "zoi kin" or "cho kin" while I was walking out. I couldn't really hear him, but I assumed it meant "goodbye" in Canto, so I replied with "Zai Jian" because he told me that he spoke both Mandarin & Canto.
Was my assumption correct? I hope I didn't look like a total idiot. D:
How do you say "goodbye" in Canto? Does it sound at least similar to what I thought he said?
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