Where is the difference between "wolltest" and "willst". I am a native german speaker myself, but was asked this by a native english speaker, and I can't explain the difference.
"Wann wolltest du mit mir sprechen?" vs "Wann willst du mit mir sprechen?"
I believe it has something to do with the time the intention to speak with me was made.
"wolltest" -> the decision to speak with me at a certain time was made in the past
"willst" -> the decision to speak with me at a certain time has still to be made.
But this is just guessing. Am I close?