Possible Results:
has formalizado
Present perfectconjugation offormalizar.
has formalizado
Present perfectvosconjugation offormalizar.

formalizar

A partir de tus datos de uso podremos saber que has visitado iberia.com y buscado un vuelo, pero que no has formalizado su reserva.
From your use data we may learn that you have visited iberia.com and searched for a flight, but you have not made your reservation yet.
Tienes que hacerlo al finalizar el proceso de automatrícula y lo puedes hacer directamente desde el sitio donde la has formalizado.
You must do this at the end of the online registration process and can do it in the same place where you have completed your registration.
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cooked with onions