Availability and Unavailability [closed]

Is it right to say - Because of availability of someone meeting is cancelled or should we say Because of unavailability of someone meeting is cancelled.


Both of your versions are clear enough, but it would be more fluent to say:

The meeting is canceled because X is unavailable.

if you want to stress the cancellation, or:

Because X is unavailable, the meeting is canceled.

if you want to stress X's attendance.