I'll share a little secret with you.... as you may have known, communication is important in hosting. Guests feel welcomed when you talk to them. While some guests may be shy to start a conversation, or some may need private time, but there's nothing wrong by asking them "How was your day?" or "Which places do you plan to visit during your trip?" If they don't want to have a long conversation, they will give short answers and leave, but chances are they have plans but need your knowledge to make the even better, thus they will appreciate your effort in asking them.
Those questions sound simple, but it shows that we care about our guests. I realize that my guests actually have a lot of questions but they don't know when or where to start, that's why hosts are the one who should start the conversation. It doesn't take much effort from us just to ask how their day was, but it really makes a difference!