How the format of web service response (.asmx) should be?

Question

Hi all,

 

I have a web service(.asmx) which returns User's details like samAccountName,Display Name.In which  format i need to return the User's data so that I can  to read the response of the web service from infopath desingener.

 I returned  the data through a List (collection object) in web service .But in infopath I couldnt get the response of the web service.Please respond.