reservabas
-you were booking
The word reservabas is the imperfect form of reservar in the second person singular. There are other translations for this conjugation.
See the full reservar conjugation

reservar

Así que esto es para lo que reservabas tu parte del generador.
So this is what you've been saving your generator rations for.
¿No se lo reservabas a un colega?
Weren't you saving it for a friend?
Si te reservabas para ella ahora entiendo la espera.
If she's the one you've been saving yourself for, I can understand the wait
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