excel conversion/reference table

Hi I was wondering, how do I create a reference table that matches two different database?
for example (in the attachment also) : If I have one database with stock name and stock number and the second database got stock name and stock ticker how do I match between the two, so If I have Microsoft stock it will know to return either the ticker or the number?
You can see that in cell I9 it returns me Microsoft though the ticker belongs to Dell.

I'd appreciate your help
Thanks in advance
Udi