/resources/conversion_value_rule.proto 

--- v18/resources/conversion_value_rule.proto   2025-08-05 14:36:07.000000000 +0000
+++ v19/resources/conversion_value_rule.proto   2025-08-05 14:36:20.000000000 +0000
@@ -111,10 +111,10 @@
   // start of the itinerary.
   message ValueRuleItineraryAdvanceBookingWindow {
     // Minimum number of days between the date of the booking the start date.
-    int32 min_days = 1;
+    optional int32 min_days = 3;

     // Maximum number of days between the date of the booking the start date.
-    int32 max_days = 2;
+    optional int32 max_days = 4;
   }

   // Range for the itinerary length in number of nights.