Just because there are 2 birds living in a cage doesn't mean you will get any babies.
He's right, you could have the most compatible birds ever, and they will not breed.
Have you done any research into breeding? It's not as easy as it looks. Just because budgies are small, doesn't mean that you can easily breed them. You should be doing as much research as possible, which will also teach you a lot about budgie genetics. You will need to learn about dominant mutations, recessive mutations, colour adding factors, sex linked mutations, dominant mutations with exceptions, hidden or split mutations, masked mutations.... the list goes on and on and on.
It's hard to say what your babies may potentially look like, since we do not know if your birds are split for any other mutations that may not be showing in their plumage. Without knowing the heritage of your birds, it's just a guessing game.
With the information you have given us above, you will have a 50% chance of Regular Green, and 50% chance of Green Spangle for both males and females. All chicks will be split for blue and Rec. Pied.
