Compare values in two columns and print the corresponding next call value.

I have a sheet which contains values in columns A, B, C and D.
I want to compare the values in D with A and if any value in D matches with A it has to print the value of B in E.
I need a formula to do this.
I used if(iserror(match())), but not sure how to print the corresponding B value in E
To say in simple ways, compare D with A and print the corresponding agent name(B) in E
I have attached an example Excel Sheet