Customerservice - chatapp

Hi everyone, I need someone who can create me a chat-software. I want the following features: When user are on backend, they are going to get a overview of the chat-window. Here do they have the option to change the headlines of the chatwindow, like change this [login to view URL] to "Your name" - they should have the possibily to persionalice it. Then would I like them to be able to add a logo. Further should they be able to customize the whole window with a unique design of their own, by uploading a JPEG or something, so that the window is not just grey. When the chat is done, the customer should be able to rate the service, and write a SHORT sentense about the customerexperience - this will be shown in backend. USERS HAVE TO REGISTER ON PAGE WITH USER THEN THEY GOT A UNIQUE HTML CODE THAT THEY JUST HAVE TO IMPLEMENT TO THEIR PAGE It should be like Zopim