Buenas
tardes.
Quisiera
reservar
una
habitación,
por
favor.
BWEH-nahs TAR-dehs. kee-SYEH-rah reh-sehr-VAR OO-nah ah-bee-tah-SYOHN, pohr fah-VOHR
Good afternoon. I would like to reserve a room, please.
"Quisiera" is the polite conditional form of "querer" (to want). It's softer than "quiero" and preferred when making requests.