Hi
Have good day
I have gone through your requirements ,We can Edit an existing Web Chat Application.
With 7 years of experience, We are pursuing projects on technologies including Android,iOS with Java SDK, Native and Hybrid with Objective C SDK, Swift, Ionic, PhoneGap, React native, Firebase, Prestashop, Magento2, BigCommerce,Codeigniter, Yii1/ Yii2, WordPress, Laravel, Core PHP, jQuery, Javascript, Bootstrap, HTML5 / CSS3
You can check my portfolio here:
https://www.freelancer.com/u/salesdkwebworld
I am glad to answer your question
Looking forward to discussing the project with you