Several profiles
Please stop creating several profiles for already existing guests. I know that this is based on the e-mail address and that Booking.com creates a new e-mail address every time a guest makes a new reservation, but this makes it impossible to track who's a regular guest and who's coming back when.

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Matthias Hautekiet commented
I Completely agree.
More fields like telephone number or address should be used as merging triggers if the name corresponds