I need a chat bot plugging in to my website

General information for the business: Legal Services Kind of development: Customization of existing program Description of requirements/functionality: I have a website www.legalexe.com that provides quotes for legal services. I require a chat bot to be developed and plugged in to the home page so that a user can chat with the bot and after answering a number of questions, the chat bot will provide a list of suitable lawyers for the user to choose a service provider. CMS and Admin requirements: The site is built using php and a bespoke CMS OS requirements: Linux Extra notes: Apache server