I am trying to lookup 2 separate ranges based on the IF statement.

For example If B3="PWR-PHYS" then I need it to lookup(A3,'DatePivot'!A1:B20,2)
But if B3 does not = "PWR-PHYS", then i need it to
lookup(A3,'Location'!A1:B20,2)

So whether it equals pwr-phys or doesnt, I need a value returned from
separate locations. Please advise how I can do this