OK Alexa

My father-in-law is in love with Alexa. In the last two years he has given us two of the voice command devices for Christmas. At first I was not so sure what to do with Alexa. Russ set her up in the kitchen thinking I would listen to music. I am old school enough that I watch regular television, with commercials and all when I am cooking.
When the second Alexa arrived we got a wall plug device with it so that Alexa could control the on/off to anything we plugged into that socket. Russ set her up in our bedroom and plugged the lamps into her. Now at night when I want to go to sleep I no longer have to get out of bed and turn off all the lamps. Instead I just say, “Alexa, bedroom off.” The three lamps turn off and in the dark of my room Alexa says “OK.”
I love turning the lights on and off with voice command. It is way better than the clapper. I never wanted to be that old lady from “clap on, clap off, the clapper” commercials. The only thing I dislike is that Alexa feels the need to say “OK” after she does as I have asked her.
Russ has researched if we could turn the, “OK” off, to no avail. I tried talking with Alexa about this.  
“Alexa, don’t say OK.” 
“I can’t find the answer to the question I heard.”
“Listen bitch, just turn the lights off and shut up about it.”
She really doesn’t like that. I am hesitant to ask her to do anything other than turning the lights off and telling me what the weather is going to be because I am so tired of hearing her say, “OK.” Please can someone tell google to do a system upgrade and have Alexa fix herself of this annoying confirmation. I just want to turn the lights off in silence like the old days when you just flipped the switch. We don’t need to have a conversation about turning off the lights. Why are robots so needy?