If you want to plot two sets of points on one scatter plot, the simplest solution is to shape your data source to have one data row for each combination of employee and year.
So revise your data source to have the following columns:
Employee
Year
Calls
Revenue
To Create a Scatter plot in Tableau,
Step i) Select the Measure. ...
Step ii) Drag Measure to the Rows Section. ...
Step iii) Select Two Dimension Fields. …
Step iv) Customize Scatter Plot in Tableau. ...
Step v) Increase Detail of Scatter Plot. ...
Step vi) Finalize Scatter plot in Tableau.
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