German phrase
Danke, aber das passt mir nicht.
Meaning
Thanks, but that won't work for me
When to use it
It politely says no. Use it when you cannot accept a suggestion or offer.
Example dialogue
Soll ich dir morgen beim Umzug helfen?
Should I help you move tomorrow?
Danke, aber das passt mir nicht. Ich muss morgen früh arbeiten.
Thanks, but that won't work for me. I have to work early tomorrow.