This greeting will be heard among observant believers and followers of the Festivals of Adonai. Or perhaps the shorter greeting: Ketivah Tovah.
The response: Gam Lamar, or G'mar Chatimah Tovah (literally, "a good sealing").
I prefer the simpler reply: Gam Atah! (to a man) Gam At! (to a woman) "you, too!"
May perfect Shalom be in your little corner of the world today!