Last of the day, I'm going away, what have you to say?

Intriguing. All the interpretations are correct, of course. That's what a work of art does, acts like a mirror. I saw it as a love poem, spoken by a woman to a man. Then I heard the voice of an infant speaking to its mother. But it can also be a poet speaking to the reader - or the reader speaking to the poet. Come back soon, I'm glad I found you.