diff --git a/src/pojo/ReserveResultPojo.py b/src/pojo/ReserveResultPojo.py
index bea5e62..c09626e 100644
--- a/src/pojo/ReserveResultPojo.py
+++ b/src/pojo/ReserveResultPojo.py
@@ -39,6 +39,9 @@ class ReserveResultPojo:
     validated_at = None
     ip_address = None
 
+    def __hash__(self):
+        return hash("{}_{}_{}_{}_{}".format(self.mail, self.first_name, self.last_name, self.phone, self.passport))
+
     @staticmethod
     def from_firestore_dict(source):
         publish_type = PublishType.ERROR