Index Match only 4 results required

Hi there.

I have 2 lists of data - Column A = Names, Column B = Dates.
The dates will always be the first of every month eg 01/08/2011 , 01/09/2011 etc.
The results I need to display from these details are any 4 names matching the next month for example:

Today's date is 29/07/2011 and the results I require would be those names matching 01/08/2011. However, if there are only 3 results, the fourth cell would remain blank, but if there are 6 results the formula can pick the first 4.

I hope that makes sense.
Thank you, in advance.