Buenas
noches,
quisiera
pedir
un
cambio
de
habitación,
por
favor.
BWEH-nahs NOH-chehs kee-see-EH-rah peh-DEER oon KAHM-bee-oh deh ah-bee-tah-see-OHN pohr fah-BOHR
Good evening, I'd like to request a room change, please.
"Quisiera" is the polite conditional form of "querer" — more courteous than "quiero" (I want).