Try https://tawk.to they have real chat agents that work on multiple sites at once, so you can have them manage your chat from about $2/hr (per website, not per person) - or if you want something automated try https://www.tensorflow.org/ (free)

There's also https://www.fiverr.com/categories/business/virtual-assistant-services/administration

Hope that's of use to you :)

Hey, have you ever tried to hire freelancers? If the job position will be Virtual you can try really good apps such as Upwork, Freelancer, or PeoplePerHour.
I had really good experiences being a virtual assistant and hiring them by these apps.
The best for your project.