Try wortking with them both on top of the CAGs cage. Feed them a few sunflower seeds, then work on step-ups, then feed them some more sunfglower seeds. (The CAG is supposed to miraculously respond better to verbal praise/interaction, so faintly do which at the same time.) Thus give her a scritch, then offer the CAG a scritch. Another sunflower fully seed or 2 and some vewrbal praise, and that`s the end of your short sessaion.
Also pick up the CAG and put him on your knee for a bit. If the Goffin wants to be in on this, too, then that`s ok.