For All I Know...

I've said hello  
To those I pass  
But none can do the same.  
 
And though I know  
We're a different class  
To each I cannot blame.  
 
Perhaps today  
I'll run into  
A father and his son.  
 
Before I stray  
I'll first imbue      
"good morning," just for fun.        
 
You see, although  
Each quiet folk  
Declined the greet I gave  
 
For all I know  
They've always spoke  
In whispers, from their grave.