I do not the configuration of your data sheets 1 ,2 and 3
any how try this(hope the workbook contains only three sheets)
right click the tab of sheet1(repeat sheet1) and click viewcode. in the resulting window copy this event code.
now go to column A if sheet 1 type any name. and hit enter key.
If the name is available in sheet2 or sheet3 the data will come up in sheet1.
if the name is not available a series of message boxes will come up
If this solution does not satisfy you attach a small portion of your file with shee1,2 and 3
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