 Hi, how are you feeling today? Great, that's just great. This is not my standard greeting, I assure you. I tend towards something a little more simple, a little less formal, such as say hello. But it is the standard greeting here. There is some debate as to the correct response to the salutation. Should one reply, I feel good using feel as a copulative to link the subject I with the subject of compliment good? Or I feel well, modifying with an adverb the subject state of being. I don't know. I am a professor of 17th century poetry specializing in the holy sonnets of John Dunn. So I just say, fine.