No one has gotten it just right yet. Here is how it goes:

<Roger>Congratulations...you have[it doesn't sound like he is using a contraction] just discovered the secret message. Please [he says "please"] send your answer to Old Pink care of the funny farm.
<guy on the phone> "Roger"
<Roger>CHALFORD --
<guy on the phone>Caroline's on the phone.
<Roger>Okay