Hullo

Whether you say hullo or hello, you are greeting a person in the same manner.

Source: tatoeba (1126658)

There he is, now. Bang went the front door open and shut. Harry shouted: “Hullo, you people. Down in five minutes.”

Source: wiktionary

“Mr Wooster?” “Oh, hullo, Lady Wickham.” [...] “Hullo, Bobbie,” I said. “Hullo, Bertie,” she said. “Hullo, Upjohn,” I said. The correct response to this would have been “Hullo, Wooster”, but he blew up in his lines and merely made a noise like a wolf with its big toe caught in a trap. [...] But as I approached the [telephone] and unhooked the thing you unhook, I was far from being at my most nonchalant, and when I heard Upjohn are-you-there-ing at the other end my manly spirit definitely blew a fuse. For I could tell by his voice that he was in the testiest of moods. Not even when conferring with me at Malvern House, Bramley-on-Sea, on the occasion when I put sherbet in the ink, had I sensed in him a more marked stirred-up-ness. “Hullo? Hullo? Hullo? Are you there? Will you kindly answer me? This is Mr Upjohn speaking.”

Source: wiktionary

Suddenly Sydney gave an exclamation. ‘Hullo! — The front door’s closed!’

Source: wiktionary