Reconsider the Room for an Anniversary Dinner

You and your sister, Lena March, are organising an anniversary dinner for your parents at Willow Hearth Restaurant. Lena booked a private room for 18 relatives, but the restaurant has now confirmed that it seats only 16. Everyone has accepted. The main dining area can accommodate all 18 at the original time, although your parents prefer a quiet setting. Alternatively, the restaurant can offer a quiet enclosed terrace for 18 two hours earlier. Two relatives would need to rearrange their work shifts. Lena is upset about changing her plans.