Learn Italian: La prima difficoltà è disdire la prenotazione. - The first difficulty is to cancel the reservation.

The suffix -ità (or just -tà) is used to turn adjectives into abstract nouns, similar to the English endings -ity or -ty. Here, the adjective difficile (difficult) becomes difficoltà (difficulty). Nouns ending in this accented -à are feminine, and their spelling does not change in the plural, so the difficulties would simply be le difficoltà.

Where does the word prenotazione come from?

It comes from the verb prenotare (to book or reserve). By dropping the verb ending and adding -zione, you create a feminine noun that describes the action or result of that verb. It functions exactly like the English suffix -tion used in the word reservation.

Disdire looks like it is related to the verb dire (to say). Is that a coincidence?

Not at all! Disdire is formed by adding the prefix dis- (which shows an opposite or reversal) to the verb dire. Literally, it means to unsay, which makes perfect sense for canceling an agreement or appointment. Because it is based on dire, it follows the exact same irregular conjugation pattern.

Why is there no preposition like di or a before the verb disdire?