French phrase
Cela ne me convient pas.
Meaning
That doesn't work for me.
When to use it
Used to decline a proposed time or arrangement. It is polite and often followed by an alternative.
Example dialogue
On se voit samedi ?
Are we meeting on Saturday?
Cela ne me convient pas. Dimanche, ça m'irait mieux.
That doesn't work for me. Sunday would work better for me.