Here are my comments about and answer to your question:
First of all dinner and diner are two different things. onelook.com/?w=diner&ls=a
Secondly, dinner generally does not take place at noon. Dinner is the evening meal. At noon you have lunch. That’s also a reason why the time around noon is also referred to as lunchtime. 8)
Now that we’ve clarified the terminology, yes, there is an expression for the break (not “rest”) from work you usually have around noon. You can call that your lunch break.
You might also have a few additional (shorter) breaks during the workday. They can simply be called breaks. Sometimes they might be called coffee breaks. (But I suspect the Brits might prefer having “tea breaks”… ;))
At our round -table discussions at my work we had breaks called coffee break though I used to say tea-break. :lol: These two expressions have penetrated into Russian language also and are called чай-брейк, кофе-брейк.