But like
What are some topics that keep it light?
How was your day?
Any plans for Christmas/New Years?
Any plans for Summer or Vacations?
What city/country would you like to visit most?
What're you up to?
Seen any good movies, TV Programmes recently?
How was work?
Just make small talk. It doesn't matter if a discussion doesn't gain any traction. There's no issue with waiting a few minutes and starting another topic.
Or, even talking about yourself a little bit (A LITTLE BIT).