if you please

The engine-driver and fireman did not see her. They were leaning out on the other side, telling the Porter a tale about a dog and a leg of mutton.

"If you please," said Roberta--but the engine was blowing off steam and no one heard her.

"If you please, Mr. Engineer," she spoke a little louder, but the Engine happened to speak at the same moment, and of course Roberta's soft little voice hadn't a chance.