Given the task definition and input, reply with output. In this task, you will be presented with a question and you have to answer the question based on your knowledge. Your answers should be as short as possible.

What is the name of the candidate whose riding was a mixed urban and suburban constituency in Calgary - with a dense urban area close to the Bow River in the south and suburbs in the north of the riding , west of Deerfoot Trail and east of Nose Hill Park ?
John Chan