I'm not sure about the Dolphin, but I can tell you that when you book Disney through them, you don't get a confirmation. I would think the Dolphin policy would be the same.
We used DU for Swan ressies and we got a confirmation number from DU and then a different one via e-mail a couple of days later with a Swan confirmation number on it. The first was seems to have been for DU to track their activities and the second was the official confirmation that we had a room and was to be used by the Swan to track the reservation in their system.
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