pushing notifcations to bot from botkit

My scenario is whenever status(approved,rejected) of request in servicenow is changed I need to push a notification to the user who has requested using botkit.

I am able to get the data from servicenow by triggering a bussines about who approved the request and who requested the request.

Now I need to send the notification to particular user who is actively chatting.How can i send that.

thank you.