How do you program a save dialog when no changes in the file has been made?

[charles61]

I have code in my save menu that brings up a dialog for saving a file with
"Don't Save", "Cancel" and "Save". After the user saves the file the first
time, the code will automatically insert the name of the file into the
dialog above when the user wants to save it again or get ready to open a new
file. Any time the user gets ready to close the file or open a new file the
dialog above (Don't Save, Cancel and Save) appears. How do I code it so that
when the user does NOT make a change to the file (preserving the save file)
the dialog of Don't Save, Cancel and Save will not appear and the file will
go ahead close or a new file dialog will appear? 
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