JsonSlurper Returning specific error status code and a template according to the return message

import groovy.json.JsonOutput;

def parser = new groovy.json.JsonSlurper();
def jsonResp = parser.parseText(responseBodyTextToClient);

String name= jsonResp.XXX.YYY.Information.Name;
String surname = jsonResp.XXX.YYY.Information.Surname;

if ( name == null || name.isEmpty()) { 
 statusCodeToClient=503;
 def pretty = JsonOutput.prettyPrint(JsonOutput.toJson([name:"", surname:""]))
 responseBodyTextToClient=pretty
}
else{
 def pretty = JsonOutput.prettyPrint(JsonOutput.toJson([name:name, surname: surname ]))
 responseBodyTextToClient=pretty
}