Help with Lookup formula

Hi all,

I am new to excel and learning on how to create a formula that would allow me to:

1. Look up Column AC1
2. If Column AC1 has the following peoples name: Ajay Devgan, Tom Cruise, John Smith
3. Then Return FDI on Column H
4. ELSE return whatever the existing value is for Column AC1

Thank you for your help

In H2