Dropdown list based on two criteria

Hi,

Thanks in advance for any thoughts or assistance you can provide. I am trying to create a drop down list that is dependent on two criteria. To depict the issue, I've created a mock-example about sports.

On my 'data' sheet:
Column 1: Name of sport
Column 2: City
Column 3: Name of sporting team

On my 'form' sheet:
Cell 1: Dropdown list to select name of sport
Cell 2: Dropdown list to select city
Cell 3: I want this cell to be a dropdown list of names of sporting teams, based on the conditions set by Cell 1 & 2.

Example is attached.

Thank you.