diff --git a/app/finders/conversation_finder.rb b/app/finders/conversation_finder.rb
index 58013f128..ecbccfb88 100644
--- a/app/finders/conversation_finder.rb
+++ b/app/finders/conversation_finder.rb
@@ -51,6 +51,7 @@ class ConversationFinder
     filter_by_team if @team
     filter_by_labels if params[:labels]
     filter_by_query if params[:q]
+    filter_by_reply_status
   end
 
   def set_inboxes
@@ -90,6 +91,10 @@ class ConversationFinder
     @conversations
   end
 
+  def filter_by_reply_status
+    @conversations = @conversations.where(first_reply_created_at: nil) if params[:reply_status] == 'unattended'
+  end
+
   def filter_by_query
     allowed_message_types = [Message.message_types[:incoming], Message.message_types[:outgoing]]
     @conversations = conversations.joins(:messages).where('messages.content ILIKE :search', search: "%#{params[:q]}%")
diff --git a/spec/controllers/api/v1/accounts/conversations_controller_spec.rb b/spec/controllers/api/v1/accounts/conversations_controller_spec.rb
index 8a874fc56..102e12477 100644
--- a/spec/controllers/api/v1/accounts/conversations_controller_spec.rb
+++ b/spec/controllers/api/v1/accounts/conversations_controller_spec.rb
@@ -15,6 +15,8 @@ RSpec.describe 'Conversations API', type: :request do
     context 'when it is an authenticated user' do
       let(:agent) { create(:user, account: account, role: :agent) }
       let(:conversation) { create(:conversation, account: account) }
+      let(:attended_conversation) { create(:conversation, account: account, first_reply_created_at: Time.now.utc) }
+      let(:unattended_conversation) { create(:conversation, account: account, first_reply_created_at: nil) }
 
       before do
         create(:inbox_member, user: agent, inbox: conversation.inbox)
@@ -43,6 +45,22 @@ RSpec.describe 'Conversations API', type: :request do
         expect(body[:data][:meta][:all_count]).to eq(1)
         expect(body[:data][:payload].first[:messages]).to eq([])
       end
+
+      it 'returns unattended conversations' do
+        agent_1 = create(:user, account: account, role: :agent)
+        create(:inbox_member, user: agent_1, inbox: attended_conversation.inbox)
+        create(:inbox_member, user: agent_1, inbox: unattended_conversation.inbox)
+
+        get "/api/v1/accounts/#{account.id}/conversations",
+            headers: agent_1.create_new_auth_token,
+            params: { reply_status: 'unattended' },
+            as: :json
+
+        expect(response).to have_http_status(:success)
+        body = JSON.parse(response.body, symbolize_names: true)
+        expect(body[:data][:meta][:all_count]).to eq(1)
+        expect(body[:data][:payload].count).to eq(1)
+      end
     end
   end