French phrase
Désolé, je ne pourrai pas venir.
Meaning
Sorry, I won't be able to come.
When to use it
An apology for being unable to come. It is a polite, gentle refusal, often followed by another plan.
Example dialogue
Désolé, je ne pourrai pas venir. On peut reporter au week-end prochain ?
Sorry, I won't be able to come. Can we postpone it until next weekend?
D'accord, dimanche ça marche.
Okay, Sunday works.