import json


def cancel_reply(id_, solver_name):
    """A reply saying a problem was canceled."""
    return json.dumps({
        "status": "CANCELLED",
        "solved_on": "2013-01-18T10:26:00.020954",
        "solver": solver_name,
        "submitted_on": "2013-01-18T10:25:59.941674",
        "type": "ising",
        "id": id_
    })