Sorry for the lack of clarity in my question.
I have a list of all the employee's names in one file and the other file has some names from some department. 

Input All employee file:
John Smith
Terry Smith
 
Input Dept file:
HR John Smith 6th floor 
R&D Terry Smith 5th floor

I would like output to be if John Smith in Dept file exists in All employee file, print out his info. 
Hope that helps clear the question a bit. 

Thanks for your advice. Will definitely read the how not to ask question :)