You can continue to contact the Chime sitters you've worked with through the Chime app or website until late June.
After that date, you'll be able to find previous families you worked with by accessing your Bookings tab within your Sittercity account. All of your previous Chime bookings will be listed under the "Past" tab within Bookings. From there, you can find information on sitters you worked with on Chime, and contact them through Sittercity. You can also message them via the Chime app until late June.