They can just talk in person or on the phone?
I was thinking of putting them in contact using text messages since people are more responsive that way. They could even decide to make a quick phone call. Unfortunately, I have students in more than 30 different countries and sometimes they would need to make an international phone call.
I have also tried inviting them to our Slack team and introducing them to each other so they can do online calls. But people who are not used to using Slack yet tend to not be very responsive, so the back and forth takes forever and people get frustrated in the process.