Trying To Learn Service Broker

I am attempting to learn Service Broker. I was following the Tutorial on http://technet.microsoft.com/en-us/library/bb839488.aspx.
However, I think I am doing something wrong.
/***
For this step, I am getting NULL for the output.

DECLARE @RecvReqDlgHandle UNIQUEIDENTIFIER;
DECLARE @RecvReqMsg NVARCHAR(100);
DECLARE @RecvReqMsgName sysname;
BEGIN TRANSACTION;
RECEIVE TOP(1)
@RecvReqDlgHandle = conversation_handle,
@RecvReqMsg = message_body,
@RecvReqMsgName = message_type_name
FROM TargetQueue1DB;
SELECT @RecvReqMsg AS ReceivedRequestMsg;
IF @RecvReqMsgName =
N'//AWDB/1DBSample/RequestMessage'
BEGIN
DECLARE @ReplyMsg NVARCHAR(100);
SELECT @ReplyMsg =
N'<ReplyMsg>Message for Initiator service.</ReplyMsg>';

SEND ON CONVERSATION @RecvReqDlgHandle
MESSAGE TYPE
[//AWDB/1DBSample/ReplyMessage]
(@ReplyMsg);
END CONVERSATION @RecvReqDlgHandle;
END
SELECT @ReplyMsg AS SentReplyMsg;
COMMIT TRANSACTION;
GO
---Output
ReceivedRequestMsg
NULL
SentReplyMsg
NULL
---
***/

And for the last step
/***

DECLARE @RecvReplyMsg NVARCHAR(100);
DECLARE @RecvReplyDlgHandle UNIQUEIDENTIFIER;
BEGIN TRANSACTION;
RECEIVE TOP(1)
@RecvReplyDlgHandle = conversation_handle,
@RecvReplyMsg = message_body
FROM InitiatorQueue1DB;
END CONVERSATION @RecvReplyDlgHandle;
SELECT @RecvReplyMsg AS ReceivedReplyMsg;
COMMIT TRANSACTION;
GO
/***
Results---
ReceivedReplyMsg
NULL

Messages---
(0 row(s) affected)
Msg 8418, Level 16, State 1, Line 11
The conversation handle is missing. Specify a conversation handle.
(1 row(s) affected)

---Output
Results---
ReceivedReplyMsg
NULL

Messages---
(0 row(s) affected)
Msg 8418, Level 16, State 1, Line 11
The conversation handle is missing. Specify a conversation handle.
(1 row(s) affected)
---
***/

I don't understand what I am missing. I have tried to see it but I don't. Can someone explain to me what I am doing wrong?
Below is all the code:

---------------------------------------------------------------------
--http://technet.microsoft.com/en-us/library/bb839488.aspx
CREATE MESSAGE TYPE
[//AWDB/1DBSample/RequestMessage]
VALIDATION = WELL_FORMED_XML;
CREATE MESSAGE TYPE
[//AWDB/1DBSample/ReplyMessage]
VALIDATION = WELL_FORMED_XML;
GO
---
CREATE CONTRACT [//AWDB/1DBSample/SampleContract]
([//AWDB/1DBSample/RequestMessage]
SENT BY INITIATOR,
[//AWDB/1DBSample/ReplyMessage]
SENT BY TARGET
);
GO
---
CREATE QUEUE TargetQueue1DB;
CREATE SERVICE
[//AWDB/1DBSample/TargetService]
ON QUEUE TargetQueue1DB
([//AWDB/1DBSample/SampleContract]);
GO
---
CREATE QUEUE InitiatorQueue1DB;
CREATE SERVICE
[//AWDB/1DBSample/InitiatorService]
ON QUEUE InitiatorQueue1DB;
GO
---
DECLARE @InitDlgHandle UNIQUEIDENTIFIER;
DECLARE @RequestMsg NVARCHAR(100);
BEGIN TRANSACTION;
BEGIN DIALOG @InitDlgHandle
FROM SERVICE
[//AWDB/1DBSample/InitiatorService]
TO SERVICE
N'//AWDB/1DBSample/TargetService'
ON CONTRACT
[//AWDB/1DBSample/SampleContract]
WITH
ENCRYPTION = OFF;
SELECT @RequestMsg =
N'<RequestMsg>Message for Target service.</RequestMsg>';
SEND ON CONVERSATION @InitDlgHandle
MESSAGE TYPE
[//AWDB/1DBSample/RequestMessage]
(@RequestMsg);
SELECT @RequestMsg AS SentRequestMsg;
COMMIT TRANSACTION;
GO
/***
SentRequestMsg
<RequestMsg>Message for Target service.</RequestMsg>
***/
---
DECLARE @RecvReqDlgHandle UNIQUEIDENTIFIER;
DECLARE @RecvReqMsg NVARCHAR(100);
DECLARE @RecvReqMsgName sysname;
BEGIN TRANSACTION;
RECEIVE TOP(1)
@RecvReqDlgHandle = conversation_handle,
@RecvReqMsg = message_body,
@RecvReqMsgName = message_type_name
FROM TargetQueue1DB;
SELECT @RecvReqMsg AS ReceivedRequestMsg;
IF @RecvReqMsgName =
N'//AWDB/1DBSample/RequestMessage'
BEGIN
DECLARE @ReplyMsg NVARCHAR(100);
SELECT @ReplyMsg =
N'<ReplyMsg>Message for Initiator service.</ReplyMsg>';

SEND ON CONVERSATION @RecvReqDlgHandle
MESSAGE TYPE
[//AWDB/1DBSample/ReplyMessage]
(@ReplyMsg);
END CONVERSATION @RecvReqDlgHandle;
END
SELECT @ReplyMsg AS SentReplyMsg;
COMMIT TRANSACTION;
GO
/***
ReceivedRequestMsg
NULL
SentReplyMsg
NULL
***/
---
DECLARE @RecvReplyMsg NVARCHAR(100);
DECLARE @RecvReplyDlgHandle UNIQUEIDENTIFIER;
BEGIN TRANSACTION;
RECEIVE TOP(1)
@RecvReplyDlgHandle = conversation_handle,
@RecvReplyMsg = message_body
FROM InitiatorQueue1DB;
END CONVERSATION @RecvReplyDlgHandle;
SELECT @RecvReplyMsg AS ReceivedReplyMsg;
COMMIT TRANSACTION;
GO
/***
Results---
ReceivedReplyMsg
NULL

Messages---
(0 row(s) affected)
Msg 8418, Level 16, State 1, Line 11
The conversation handle is missing. Specify a conversation handle.
(1 row(s) affected)
***/
---

---------------------------------------------------------------------

This web page helped me so much. This makes more sense to me now.
http://articles.techrepublic.com.com/5100-10878_11-6156264.html#