If a muslim male greets with the salaam gesture (no words), how is a non-muslim

woman supposed to reply? I would like to know if I´m supposed to gesture in the same way (I don´t know the exact name for the gesture, and I guess it belongs to the muslim tradition). I don´t know exactly how to do that gesture. I really hope somebody can help me, since I want to be as respectful as possible. Thank you.