```ruby
class Flight
  attr_reader :from, :to

  def initialize(from, to)
    @from = from
    @to = to
  end
end

ParameterType(
  name: 'flight',
  regexp: /([A-Z]{3})-([A-Z]{3})/,
  transformer: -> (from, to) { Flight.new(from, to) }
)

Given('{flight} has been delayed {int} minutes') do |flight, delay|
  expect(flight.from).to eq('LHR')
  expect(flight.to).to eq('CDG')
  expect(delay).to eq(45)
end
```

Implement step raising an UndefinedParameterType error
user
```ruby
class Flight
  attr_reader :from, :to

  def initialize(from, to)
    @from = from
    @to = to
  end
end

ParameterType(
  name: 'flight',
  regexp: /([A-Z]{3})-([A-Z]{3})/,
  transformer: -> (from, to) { Flight.new(from, to) }
)

Given('{flight} has been delayed {int} minutes') do |flight, delay|
  expect(flight.from).to eq('LHR')
  expect(flight.to).to eq('CDG')
  expect(delay).to eq(45)
end

Given('{airport} is closed because of a strike') do |airport|
  raise StandardError, 'Should not be called because airport type not defined'
end
```
assistant