Hi. You can try Facebook Chat Box to communicate with customers through Messenger. Facebook is a popular social network, so many customers can use this network too. You publish a business page and chat with web visitors through Messenger platform.
Feel free to try us out at Reamaze.com / https://apps.shopify.com/reamaze . We're trusted and used by thousands of Shopify stores and Plus stores to engage with and converse with their customers across multiple channels such as live chat, FB, Instagram, Twitter, SMS and email.
I'm a co-founder at Re:amaze.
If you’re looking for a live chat app that would be available on Shopify store, check out our HelpCenter App. It’s very easy to set up and allows your customers to reach out to you in-real time.
There are also two other features in HelpCenter - FAQ builder and help desk ticketing system, which both can help you improve the quality of your customer service.