Autocomplete city field with yandex suggestView

Question

I have an input field for the city. I need a drop-down list of cities to appear when I start entering a city. ONLY CITIES.

<input type="text" name="city" id="city">

I have a js function, but it shows not only cities, but also regions and the like, but I only need cities

function onLoad (ymaps) {
   var suggestView = new ymaps.SuggestView('city');        
}

It would also be nice to add an error when pressing a button if the user has not selected anything from the list

Hepl please