That is currently not an option in RIngCentral. There was a topic started on that two years ago. You might want to read it to find out what's been requested and what's been going on with it. The link is below.
@Phong Vu every time i go to add in the Auto-Reply SMS bot it says "we are un able to add the bot to your account. please contact the bot developer" not sure why this is happening