Queue is empty

I have created queue and service, but when i start timet to send message in queue, it is empty.
Why? What could be wrong?

CREATE PROCEDURE dbo.myProcedure
AS
RETURN 'test'

CREATE QUEUE [dbo].[myQueue] WITH STATUS = ON , RETENTION = OFF , 
ACTIVATION (  STATUS = ON , PROCEDURE_NAME = [dbo].[myProcedure], MAX_QUEUE_READERS = 1 , EXECUTE AS N'dbo'  ), 
POISON_MESSAGE_HANDLING (STATUS = OFF)  ON [PRIMARY] 

CREATE SERVICE [myService]  AUTHORIZATION [dbo] 
ON QUEUE [dbo].[myQueue]([DEFAULT])

DECLARE @DialogHandle UNIQUEIDENTIFIER;

BEGIN dialog CONVERSATION @DialogHandle 
FROM SERVICE myService
TO SERVICE  'myService'
ON CONTRACT [DEFAULT]
WITH ENCRYPTION = OFF;

BEGIN CONVERSATION TIMER (@DialogHandle) TIMEOUT = 1;

SELECT * from myQueue --is empty

--I can see the result in conversation endPoints:
SELECT * FROM sys.conversation_endpoints WHERE far_service='myService'
--what else should I check?

Thanks