input: Write a python function to return the list of bookings for a specific room from a csv file.
  assert retrieve_bookings('room1', 'dataset.csv') == [{'date': '2023-10-01', 'time': '10:00', 'bookedBy': 'Alice'}, {'date': '2023-10-02', 'time': '14:00', 'bookedBy': 'Bob'}]
  assert retrieve_bookings('room2', 'dataset.csv') == [{'date': '2023-10-03', 'time': '09:00', 'bookedBy': 'Charlie'}]
  assert retrieve_bookings('room3', 'dataset.csv') == []
output: import csv
  
  def retrieve_bookings(room, filename):
      bookings = []
      with open(filename, mode='r', newline='') as file:
          reader = csv.DictReader(file)
          for row in reader:
              if row['room'] == room:
                  booking = {
                      'date': row['date'],
                      'time': row['time'],
                      'bookedBy': row['bookedBy']
                  }
                  bookings.append(booking)
      return bookings