Connect field to user directory
Create a field type that allows searching the internal user directory and selecting a user (email address).
Example: We have a request form where the user would need to select the physician responsible - we could then use Flow to send a notification to that Physician in addition to the normal email path that responses go to.
We have a form where you can nominate employees for employee of the month. It's currently being done by email address, but about once a week somebody gets it wrong.