how to set off an alarm or alert with alert sound lasting until user presses a button in native script

Question

I've just started learning Native script and I'm working on a project that checks a price for a certain item and alerts the user if the price has reached the set amount. I want the alert to last until the user takes an action to turn it off similar to when you set an alarm and have to press "stop" for it to end. Is there a thing I can call to make that happen, also I need the alert to bypass silence mode and basically function just like the alarm clock but able to be triggered at any time. any help would be appreciated. Thank you.