阅读短文，判断句子是否正确。

Last Saturday morning, Mike went to a supermarket. He wanted to buy a big cake for his father. There were many people in the supermarket. Suddenly. Mike saw a new schoolbag on the floor.

"Excuse me. Is this your schoolbag, sir?" He asked the man in front of him." No, it isn't," the man said," perhaps it's hers." He pointed to the woman in front of him.

"Is this your schoolbag?" he asked the woman." Let me have a look. Oh, yes, it is. Thank you very much."