If the result to the below formula is "0", how can I rewrite this to say "No
Respones"?

=IF(C5="APR07",VLOOKUP(C6,APR07!D16:AB600,4,FALSE) ,IF(C5="MAY07",VLOOKUP(C6,MAY07!D16:AB600,4,FALSE) ,IF(C5="JUN07",VLOOKUP(C6,JUN07!D16:AB600,4,FALSE) ,"No
Data")))