diff --git a/conversation_assign.go b/conversation_assign.go
index 7342640..bbb6ede 100644
--- a/conversation_assign.go
+++ b/conversation_assign.go
@@ -20,6 +20,8 @@ type AssignmentParams struct {
 	// Timestamp optionally defines the time when the conversation was assigned.
 	// If not given, this will default to the current time.
 	Timestamp *time.Time `json:"timestamp,omitempty"`
+
+	Reason string `json:"reason,omitempty"`
 }
 
 // AssignConversation assigns a conversation to a participant.
diff --git a/conversation_cancel.go b/conversation_cancel.go
index 4c354a4..dc8d2ec 100644
--- a/conversation_cancel.go
+++ b/conversation_cancel.go
@@ -11,6 +11,9 @@ type CancelParams struct {
 	// Timestamp optionally defines the time when the conversation was cancelled.
 	// If not given, this will default to the current time.
 	Timestamp *time.Time `json:"timestamp,omitempty"`
+
+	// Reason optionally allows you to describe why this cancellation is happening.
+	Reason string `json:"reason,omitempty"`
 }
 
 // CancelConversation cancels the conversation.
diff --git a/conversation_finish.go b/conversation_finish.go
index d56d3e5..9445da5 100644
--- a/conversation_finish.go
+++ b/conversation_finish.go
@@ -11,6 +11,9 @@ type FinishParams struct {
 	// Timestamp optionally defines the time when the conversation ended.
 	// If not given, this will default to the current time.
 	Timestamp *time.Time `json:"timestamp,omitempty"`
+
+	// Reason optionally allows you to describe why this conversation is being finished.
+	Reason string `json:"reason,omitempty"`
 }
 
 // FinishConversation finishes a conversation.