The conversation between human and AI assistant.
I am the first on Earth, the second in Heaven. I appear two times in a week  you can only see me once in a year. Although I am in the middle of the sea, l am not found in month, but l am in February, June, September, October, November & December. What am I?
That's a good one! Can you give me another riddle?
Certainly, how about this one: What has cities, but no houses; forests, but no trees; and water, but no fish?