diff --git a/proto/cmp/services/cancellation/v1/cancellation_reason.proto b/proto/cmp/services/cancellation/v1/cancellation_reason.proto
new file mode 100644
index 0000000..8f271d7
--- /dev/null
+++ b/proto/cmp/services/cancellation/v1/cancellation_reason.proto
@@ -0,0 +1,86 @@
+syntax = "proto3";
+
+package cmp.services.cancellation.v1;
+
+enum CancellationReason {
+  // Default unspecified value
+  CANCELLATION_REASON_UNSPECIFIED = 0;
+
+  // Guest-Initiated: Change in Travel Plans
+  CANCELLATION_REASON_SCHEDULE_CONFLICT = 1;
+  CANCELLATION_REASON_WORK_RELATED = 2;
+  CANCELLATION_REASON_FAMILY_EMERGENCY = 3;
+  CANCELLATION_REASON_VISA_PASSPORT_ISSUE = 4;
+  CANCELLATION_REASON_TRANSPORTATION_ISSUE = 5;
+  CANCELLATION_REASON_WEATHER_CONCERN = 6;
+
+  // Guest-Initiated: Financial Reasons
+  CANCELLATION_REASON_FOUND_BETTER_RATE = 7;
+  CANCELLATION_REASON_BUDGET_CONSTRAINT = 8;
+  CANCELLATION_REASON_CURRENCY_FLUCTUATION = 9;
+  CANCELLATION_REASON_UNEXPECTED_EXPENSE = 10;
+  CANCELLATION_REASON_PAYMENT_ISSUE = 11;
+
+  // Guest-Initiated: Personal Preferences
+  CANCELLATION_REASON_CHANGED_DESTINATION = 12;
+  CANCELLATION_REASON_FOUND_BETTER_ACCOMMODATION = 13;
+  CANCELLATION_REASON_GROUP_SIZE_CHANGE = 14;
+  CANCELLATION_REASON_LENGTH_OF_STAY_CHANGE = 15;
+  CANCELLATION_REASON_AMENITY_REQUIREMENT_CHANGE = 16;
+
+  // Guest-Initiated: Health & Safety
+  CANCELLATION_REASON_ILLNESS_OR_INJURY = 17;
+  CANCELLATION_REASON_TRAVEL_ADVISORY = 18;
+  CANCELLATION_REASON_HEALTH_RESTRICTION = 19;
+  CANCELLATION_REASON_DESTINATION_SAFETY_CONCERN = 20;
+  CANCELLATION_REASON_COVID_RELATED = 21;
+
+  // Host/Property-Initiated: Property Issues
+  CANCELLATION_REASON_MAINTENANCE_PROBLEM = 22;
+  CANCELLATION_REASON_OVERBOOKING = 23;
+  CANCELLATION_REASON_PROPERTY_DAMAGE = 24;
+  CANCELLATION_REASON_RENOVATION_WORK = 25;
+  CANCELLATION_REASON_TECHNICAL_SYSTEM_FAILURE = 26;
+
+  // Host/Property-Initiated: Operational Issues
+  CANCELLATION_REASON_STAFFING_PROBLEM = 27;
+  CANCELLATION_REASON_TEMPORARY_CLOSURE = 28;
+  CANCELLATION_REASON_LICENSE_PERMIT_ISSUE = 29;
+  CANCELLATION_REASON_OWNERSHIP_CHANGE = 30;
+  CANCELLATION_REASON_BOOKING_SYSTEM_ERROR = 31;
+
+  // Host/Property-Initiated: Policy Violations
+  CANCELLATION_REASON_INVALID_CREDIT_CARD = 32;
+  CANCELLATION_REASON_SUSPICIOUS_ACTIVITY = 33;
+  CANCELLATION_REASON_HOUSE_RULE_VIOLATION = 34;
+  CANCELLATION_REASON_INCOMPLETE_GUEST_INFO = 35;
+  CANCELLATION_REASON_FAILED_VERIFICATION = 36;
+
+  // System-Related: Technical Issues
+  CANCELLATION_REASON_DOUBLE_BOOKING = 37;
+  CANCELLATION_REASON_SYSTEM_GLITCH = 38;
+  CANCELLATION_REASON_PAYMENT_PROCESSING_ERROR = 39;
+  CANCELLATION_REASON_CALENDAR_SYNC_ERROR = 40;
+  CANCELLATION_REASON_RATE_PLAN_ERROR = 41;
+
+  // System-Related: Administrative Reasons
+  CANCELLATION_REASON_PROPERTY_DELISTING = 42;
+  CANCELLATION_REASON_CONTRACT_TERMINATION = 43;
+  CANCELLATION_REASON_ACCOUNT_SUSPENSION = 44;
+  CANCELLATION_REASON_REGULATORY_COMPLIANCE = 45;
+  CANCELLATION_REASON_PLATFORM_POLICY_VIOLATION = 46;
+
+  // Force Majeure: Natural Disasters
+  CANCELLATION_REASON_EARTHQUAKE = 47;
+  CANCELLATION_REASON_FLOOD = 48;
+  CANCELLATION_REASON_HURRICANE = 49;
+  CANCELLATION_REASON_VOLCANIC_ACTIVITY = 50;
+  CANCELLATION_REASON_SEVERE_WEATHER = 51;
+
+  // Force Majeure: External Factors
+  CANCELLATION_REASON_CIVIL_UNREST = 52;
+  CANCELLATION_REASON_POLITICAL_INSTABILITY = 53;
+  CANCELLATION_REASON_STRIKE_ACTION = 54;
+  CANCELLATION_REASON_PUBLIC_HEALTH_EMERGENCY = 55;
+  CANCELLATION_REASON_GOVERNMENT_RESTRICTION = 56;
+}
diff --git a/proto/cmp/services/cancellation/v1/rejection_reason.proto b/proto/cmp/services/cancellation/v1/rejection_reason.proto
new file mode 100644
index 0000000..c0e85fc
--- /dev/null
+++ b/proto/cmp/services/cancellation/v1/rejection_reason.proto
@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package cmp.services.cancellation.v1;
+
+enum CancellationRejectionReason {
+  CANCELLATION_REJECTION_REASON_UNSPECIFIED = 0;
+  CANCELLATION_REJECTION_REASON_TECHNICAL_ERROR = 1;
+  CANCELLATION_REJECTION_REASON_INVALID_SERVICE_OR_BOOKING_REFERENCE = 2;
+  CANCELLATION_REJECTION_REASON_BOOKING_IS_ALREADY_CANCELLED = 3;
+  CANCELLATION_REJECTION_REASON_SERVICE_HAS_STARTED_OR_HAS_BEEN_DELIVERED = 4;
+  CANCELLATION_REJECTION_REASON_CANCELLATION_WINDOW_EXPIRED = 5;
+  CANCELLATION_REJECTION_REASON_SERVICE_CANNOT_BE_CANCELLED_ONLINE = 6;
+  CANCELLATION_REJECTION_REASON_RATE_OR_FARE_CANNOT_BE_CANCELLED = 7;
+  CANCELLATION_REJECTION_REASON_ENTIRE_PACKAGE_MUST_BE_CANCELLED = 8; // Service forms part of a package, the entire package must be cancelled
+  CANCELLATION_REJECTION_REASON_REFUND_CURRENCY_NOT_SUPPORTED = 9;
+}