At the time I was working in a call center but only for employees of my own company (thousands of employees, multiple different sites and buildings all over the place)

I received a call from a girl, and eventually had to reach out again to make sure her problem was fixed. Continued the talking over Skype (business has it for employees to reach each other easily) and eventually figured out she lived only 25 minutes away.

Talking lead to flirting and we did the deed twice. A year apart between the 2 times though and we talked every now and then between those 2 times but she eventually met someone and me too. So apart from taking news from each other like every couple months it never lead to anything else!