Disclaimer: I cannot claim to be, nor to have been J.R.R Tolkien. Therefore, all characters of his creation remain of his creation and not my own. As to the characters of my own fabrication, as well as the text that follows: I take full responsibility.
Notes:
I have let mellryn stand for mallorn, though in the Lord of the Rings both Haldir and Legolas refer to them as mallorn. They are speaking in Westron (or the Common Language), so I take it that mellryn is the elven term.
Legolas has clearly been to Lothlórien, as evidenced by his knowledge of the land and trees (notably when he says, "Alas that it is winter!"). When that took place is not mentioned, and so I have taken the liberty of guessing it was early in his youth. This is mostly fueled by the fact that Legolas mentions that some time has passed since any of his people have traveled to Lothlórien.
Referring to the Lórien as Lothlórien may be inappropriate, as Galadriel refers to it always as the Lórien, but I have chosen to go with Lothlórien as it is the full title.