French phrase
Seriez-vous disponible le ~ à ~ ?
Meaning
Would you be available on ___ at ___?
When to use it
A polite way to ask about someone's availability. Common in formal scheduling.
Example dialogue
Seriez-vous disponible le 15 septembre à 18h ?
Would you be available on September 15 at 6:00 p.m.?
Je suis pris le 15; le 16 à 18h me conviendrait.
I'm busy on September 15; 6:00 p.m. on the 16th would work for me.