def reject_hit(client, assignment_id, feedback):
    """Rejects a HIT assignment on MTurk
    
    Parameters
    ----------
    client : MTurk.Client
        A boto3 client for MTurk
    assignment_id : string 
        The ID of the assignment. The assignment must correspond to a HIT created by the Requester.
    feedback: string
        A message for the Worker, which the Worker can see in the Status section of the web site.
    
    Returns
    -------
    bool
        returns whether the operation was successful
    """ 
    response = client.reject_assignment(
        AssignmentId=assignment_id,
        RequesterFeedback=feedback)
    return response=={}