Proper noun is a noun which refers to particular thing, like Mr.Brown, India, Bali, Hendric. Here, proper means one's own (Wren & Martin, 1996). For examples, Mr. Brown is a lawyer. Mr. Brown is a proper noun and it positions at a subject. Common noun is a general noun. In other words, common noun refers to something general or the opposite of proper noun, like country, man, building, etc.
He needs confirmation from the reservation staff.
ref. no. 3QDF6ENXP5XG