That's okay. (Emily letting me off the hook for a nine-am post tomorrow.)
Thank you. (The most important feeling/words you can feel/say, IMO.)
Take care of yourself. (Not in a judgmental way, as in, "You are not taking care of yourself." In the sense of, "Take care of yourself first," when someone is trying to take care of someone else.)
What else do you love to say/hear?