If you are travelling with an accompanying passenger, you will be allocated a seat next to yours so that this person can be close at hand to help you (with meals, using the toilet, etc.) throughout your journey.
If you need special assistance, equipment or services you must request them when you book your flight.
The request will then be confirmed. You must confirm your reservation(including accompanying passenger) for the whole journey.
For more info and reservations, contact your nearest Alitalia office.