["I haven't seen my son in 2 years since he left for the military.", 'Oh, that must be heartbreaking for you. Do you know where he is?', "I don't but he told me he will be home to visit me for my birthday. I can't wait!"]
That would be the best birthday present ever! I know he'll make every effort possible to be with you.
I haven't seen my son in 2 years since he left for the military. He told me he is coming to visit me for my birthday. I can't wait.