status.dart

import 'package:meta/meta.dart';

class CoordinatorStatus {}

class UserinfoModel {}

class _UserStatus extends CoordinatorStatus {
  UserinfoModel model;

  _UserStatus({this.model});
}

class _UnBookingStatus extends _UserStatus {
  _UnBookingStatus({@required UserinfoModel model}) : super(model: model);
}

class _BookingStatus extends _UserStatus {
  _BookingStatus({@required UserinfoModel model}) : super(model: model);
}

void main() {
  var ubs = _UnBookingStatus(model: UserinfoModel());
  print(ubs.model);
  var bs = _BookingStatus(model: UserinfoModel());
  print(bs.model);
}