Lawsuit tossed out by belly laughing judge in 9... 8... 7...
Arizona is a "right to work" state. Employees can leave at any time, for any reason, with no notice given; contrarily, employers can drop you like a hot rock for any reason - or no reason at all - with no notice whatsoever.
"No call/no show" is just about as valid a reason to fire an employee as the restaurant needs to come up with.