This is a regular verb. It follows the conjugation pattern of the verb hablar.
PresentPresente
Siempre reservo mesa antes de ir al restaurante.
I always reserve a table before going to the restaurant.
PreteritePretérito indefinido
La semana pasada reservamos dos habitaciones para el fin de semana.
Last week we reserved two rooms for the weekend.
ConditionalCondicional
Yo reservaría los billetes con tiempo.
I would book the tickets in advance.