Custom JSON generate for Rest API response

JSONGenerator gen = JSON.createGenerator(true);
     gen.writeStartObject();
     gen.writeFieldName('Patient Satisfactions');
     gen.writeStartArray();

            for (Patient_Satisfaction__c  patientSatisfaction : patientSatisfactions) {
                gen.writeStartObject();
                gen.writeStringField('First name', patientSatisfaction.Reporter_First_Name__c);
                gen.writeStringField('Last name', patientSatisfaction.Reporter_Last_Name__c);
                gen.writeStringField('Phone', patientSatisfaction.Reporter_Phone__c);
                gen.writeStringField('description', patientSatisfaction.Description_of_Feedback__c);
                gen.writeStringField('Name', patientSatisfaction.Name);
                gen.writeNumberField('incident_group_id', 7387);
                gen.writeEndObject();
            }

    gen.writeEndArray();
    gen.writeEndObject();
    String jsonData = gen.getAsString();
    restContext.response.responseBody= blob.valueOf(jsonData);
    system.debug('Json data'+jsonData );