reservarías
-you would book
The word reservarías is the conditional form of reservar in the second person singular. There are other translations for this conjugation.
See the full reservar conjugation

reservar

¿Me reservarías un vuelo a Los Ángeles para mañana?
Would you book me on the flight tomorrow for los angeles?
Me imaginé que te reservarías lo mejor.
Kind of figured you'd save the best for yourself.
No, me reservarías solo para ti.
No, you wouldn't. You'd keep me for yourself.
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