Adde 'fullName' method to the Person model to achieve the full name as string.

app/Person.php

@@ -126,4 +126,18 @@ class Person extends Model
     {
         return $this->hasManyThrough('\App\SubBooking', '\App\PersonTarget');
     }
+
+    /*
+     * Get the full name of the person.
+     *
+     * @return string
+     */
+    public function fullName()
+    {
+        if ($this->title == 'Firma') {
+            return $this->name_or_company;
+        } else {
+            return $this->surname . ' ' . $this->name_or_company;
+        }
+    }
 }