It's possible that:
* The poem title is misremembered. Perhaps you're thinking of a different poem by Flint or another author.
* The poem is not widely known. It might be a lesser-known work by Flint that is not readily available online.
* The poem does not exist. It's possible that there is no such poem, or it is a poem that was never published.
If you have any other information about the poem, such as lines from it or the context in which you encountered it, it might be helpful in identifying it.