Is it possible to get username of a chosen recipient in "Do Transition" dialog box via PDM API???

In "do Transition" dialog box there is a possibility to notify other user that the document has changed state (e.g. assigned for reviewing to the user). And there is a list of users from which we can choose and based on chosen message system.

I'm wondering if there is a PDM API method to get a chosen "user name" value.

SolidworksApi/macros