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If EDreams supplied you with a PNR (Aegean's 6-digit booking record number), use that number on Aegean Airlines' website to retrieve your booking details.
If EDreams didn't send you the PNR, then ask EDreams to provide it, and/or ask Aegean to retrieve your booking information.
When you have the PNR, retrieve your booking information from Aegean's webpage to see the details. If the details are not shown, then you could do any of the following: