French phrase
Je ne pourrai pas assister à ~.
Meaning
I won't be able to attend ___.
When to use it
States that attendance will not be possible. It is polite and suitable for professional or everyday situations.
Example dialogue
Tu peux venir à la réunion demain ?
Can you come to the meeting tomorrow?
Je ne pourrai pas assister à la réunion.
I won't be able to attend the meeting.