How to create alerts/warnings in Outlook/Calendar based on external data?

Hi,

I'm wondering if it is possible to create popups/warning messages in Outlook when users perform specific actions, based on integration data.

For context, we have an integration that makes use of the Outlook Calendar API. Events in Outlook are linked to meetings in our application through an event ID. We are subscribed to change notifications that let us know when these calendar records are deleted. The goal is to delete them in our own app when a user deletes them in Outlook. That alone is relatively straightforward.

My question is this - is it possible to create some kind of alert or popup in Outlook when a user decides to delete a calendar meeting that is linked to a meeting in our app? The idea is to introduce functionality that lets the Outlook user decide whether they want to delete both the Outlook event and the linked event, or just the Outlook event.