How can you find someone if you only know where they work and their first name?

I know I must sound totally weird, but I REALLY need to talk to and thank somebody for what they did for me. Please help.

How can you find someone if you only know where they work and their first name?
okay search in google white pages, and enter their name and results should pop up
Reply:You can always wait till they finish there work, and you follow them to their house. Works all the time.




















Hahaha
Reply:call the place where they work and ask for them
Reply:knowing their name and where they work is plenty!


cant you just go to their work and tell them thanks? or mail a thank you card to their work?
Reply:Go to there job and ask for them