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The Spanish word

tengo una reserva

means
I have a reservation
Examples:
Tengo una reserva.
I've got a reservation.
Hola, tengo una reserva, mi nombre es Kaori Yoshikawa. Aquí está la tarjeta de confirmación.
Hello, I have a reservation, my name is Kaori Yoshikawa. Here is the confirmation card.
Examples sourced from tatoeba.org