diff --git a/v1/client.go b/v1/client.go
index da677e0..429f2c8 100644
--- a/v1/client.go
+++ b/v1/client.go
@@ -339,6 +339,42 @@ func (c *MgClient) DialogAssign(request DialogAssignRequest) (DialogAssignRespon
 	return resp, status, err
 }
 
+// DialogUnassign allows to remove responsible from the dialogue
+//
+// Example:
+//
+// 	var client = v1.New("https://demo.url", "09jIJ")
+//
+// 	data, status, err := client.DialogUnassign(1)
+//
+// 	if err != nil {
+// 		fmt.Printf("%v", err)
+// 	}
+//
+// 	if status >= http.StatusBadRequest {
+// 		fmt.Printf("%v", err)
+// 	}
+//
+// 	fmt.Printf("%v\n", data.Responsible)
+func (c *MgClient) DialogUnassign(dialogID uint64) (DialogUnassignResponse, int, error) {
+	var resp DialogUnassignResponse
+
+	data, status, err := c.PatchRequest(fmt.Sprintf("/dialogs/%d/unassign", dialogID), nil)
+	if err != nil {
+		return resp, status, err
+	}
+
+	if status != http.StatusOK {
+		return resp, status, c.Error(data)
+	}
+
+	if err := json.Unmarshal(data, &resp); err != nil {
+		return resp, status, err
+	}
+
+	return resp, status, err
+}
+
 // DialogClose close selected dialog
 //
 // Example:
diff --git a/v1/client_test.go b/v1/client_test.go
index 3d190c9..ad18879 100644
--- a/v1/client_test.go
+++ b/v1/client_test.go
@@ -249,6 +249,63 @@ func TestMgClient_DialogAssign(t *testing.T) {
 	assert.Equal(t, http.StatusBadRequest, status)
 }
 
+func TestMgClient_DialogUnassign(t *testing.T) {
+	c := client()
+	defer gock.Off()
+
+	t.Run("success", func(t *testing.T) {
+		gock.New(mgURL).
+			Patch("/api/bot/v1/dialogs/777/unassign").
+			Reply(200).
+			BodyString(`{"previous_responsible": {"id": 111, "type": "bot", "assigned_at": "2020-07-14T14:11:44.000000Z"}}`)
+
+		resp, status, err := c.DialogUnassign(777)
+
+		assert.NoError(t, err)
+		assert.Equal(t, http.StatusOK, status)
+
+		assert.Equal(t, int64(111), resp.PreviousResponsible.ID)
+		assert.Equal(t, "bot", resp.PreviousResponsible.Type)
+		assert.Equal(t, "2020-07-14T14:11:44.000000Z", resp.PreviousResponsible.AssignAt)
+	})
+
+	t.Run("dialog not latest in chat", func(t *testing.T) {
+		gock.New(mgURL).
+			Patch("/api/bot/v1/dialogs/666/unassign").
+			Reply(400).
+			BodyString(`{"errors": ["dialog is not the latest in the chat"]}`)
+
+		_, status, err := c.DialogUnassign(666)
+
+		assert.Error(t, err, "dialog is not the latest in the chat")
+		assert.Equal(t, http.StatusBadRequest, status)
+	})
+
+	t.Run("dialog is not assigned", func(t *testing.T) {
+		gock.New(mgURL).
+			Patch("/api/bot/v1/dialogs/555/unassign").
+			Reply(400).
+			BodyString(`{"errors": ["dialog is not assigned"]}`)
+
+		_, status, err := c.DialogUnassign(555)
+
+		assert.Error(t, err)
+		assert.Equal(t, http.StatusBadRequest, status)
+	})
+
+	t.Run("dialog not found", func(t *testing.T) {
+		gock.New(mgURL).
+			Patch("/api/bot/v1/dialogs/444/unassign").
+			Reply(404).
+			BodyString(`{"errors": ["dialog #444 not found"]}`)
+
+		_, status, err := c.DialogUnassign(444)
+
+		assert.Error(t, err)
+		assert.Equal(t, http.StatusNotFound, status)
+	})
+}
+
 func TestMgClient_DialogClose(t *testing.T) {
 	c := client()
 	i := 1
diff --git a/v1/types.go b/v1/types.go
index c7f8947..1cd608f 100644
--- a/v1/types.go
+++ b/v1/types.go
@@ -315,6 +315,10 @@ type (
 		IsReAssign          bool        `json:"is_reassign"`
 	}
 
+	DialogUnassignResponse struct {
+		PreviousResponsible Responsible `json:"previous_responsible,omitempty"`
+	}
+
 	MessagesResponseItem struct {
 		Message
 		ChannelID     uint64 `json:"channel_id,omitempty"`