Alert to User Who Made Cell Change

Sara C
Sara C
edited 12/09/19 in Smartsheet Basics

Hi - 

I cannot figure out how to word my need so that I can search for it in the community posts. I am looking for either an alert or reminder, I think, for this situation:

A user, *not always the same user*, adds a job number to the 'job number' column but left the 'approved hours' column blank. As Smartsheet is constantly saving changes, and saves before you exit, I want a reminder/alert/something, to pop up/email the user when they try to or successfully save the sheet when there is a value in the 'job number' column but not in the 'approved hours' column. 

Does this make sense?