Populate User data into InfoPath form

Open your InfoPath form

Tools menu -> Data connection > Click on Add button

Add new data connection 

Select Web Service

Enter web service URL http://site/_vti_bin/userprofileservice.asmx Click Next.

Select GetUserProfileByName method and select the Property for ex: WorkEmail and save and close

Select field(WorkEmail) where you want to populate the data. Go to properties

Click on Fx button. Select a field or group button. Select the created datasource and click on value field and then click on filter data button.

Filter condition is : Name is equal to WorkEmail. Close all the windows.

Preview InfoPath and see the result.