Alexa and Jason get on each other's nerves at work, and it doesn't get any better when their boss lets them compete for a promotion. At the same time, both are dumped by their respective ones. When Alexa gets dumped, she also happens to destroy her phone and lose all her contacts. With her new phone, she messages her best friend but remembers the wrong number and accidentally ends up messaging Jason. Without knowing who the other is, they start messaging each other and develop a friendship while competing with each other at work.
A better variation on "You've got mail". I weighed this for a long time but it picks up and works in the end.