Creating Dropdown Which Changes Adjacent Cell Data?

I'm revamping a key inventory for my company and would like to be able to track the history of each key (name of person who it was issued to, date issued, date returned). I figure the best way to do this for the 90 keys I currently have in circulation is to create drop down lists for each key that has been used by more than one person in its history and upon selecting a given person from the drop down list of keys used more than once, the adjacent cells would populate with the corresponding data of date issued and date returned. Some keys have not been used more than once so not every key will have a drop down. Here is what my key inventory spreadsheet looks right now.