SAN FRANCISCO — Until recently, Robyn Ewing was a writer in Hollywood, developing TV scripts and pitching pilots to film studios.

Now she’s applying her creative talents toward building the personality of a different type of character — a virtual assistant, animated by artifical intelligence, that interacts with sick patients.

Ewing works with engineers on the software program, called Sophie, which can be downloaded to a smartphone. The virtual nurse gently reminds users to check their medication, asks them how they are feeling or if they are in pain, and then sends the data to a real doctor.

As tech behemoths and a wave of start-ups double down on virtual assistants that can chat with human beings, writing for AI is becoming a hot job in Silicon Valley. Behind Apple’s Siri, Amazon’s Alexa and Microsoft’s Cortana are not just software engineers. Increasingly, there are poets, comedians, fiction writers, and other artistic types charged with engineering the personalities for a fast-growing crop of artificial intelligence tools.

“Maybe this will help pay back all the student loans,” joked Ewing, who has master’s degrees from the Iowa Writer’s Workshop and film school.

Unlike the fictional characters that Ewing developed in Hollywood, who are put through adventures, personal trials and plot twists, most virtual assistants today are designed to perform largely prosaic tasks, such as reading through email, sending meetings reminders or turning off the lights as you shout across the room.

But a new crop of virtual assistant start-ups, whose products will soon flood the market, have in mind more ambitious bots that can interact seamlessly with human beings.

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