PP is correct. Unless you wrote down the confirmation number or saved the confirmation email, you will have to call to get your ADR information. It can only be retrieved online with the confirmation #.
I was in the same boat, had mistyped one of the reservations on my google calendar (yes, I am one of those that creates a calendar with reservation dates, times, confirmation numbers, what park I am in that day, big events..etc).
Called 407-WDW-DINE, they found all my reservations by my phone number(s), my travel agent used home phone and I used cell phone for my online ones. She helped me confirm they all matched my calendar and moved them all to the cell phone number, even linked my reservation for my campsite to them so they could be pulled when I arrive.
So no worries, they can be found without the confirmation number!
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