Hi there,
It will be easier to understand your requirement with an example, for example if your web site is for booking stay/room in a hotel, so to “Book hotel” is the objective, then the user will be prompted for the location, check-in date, number of nights, etc.) You simply have to provide me a list of parameters you want to collect from your bot users, as well as the corresponding prompts, and then the app will take care of orchestrating the dialogue by prompting for the appropriate questions.
I could provide you a live demo for a demo chatbot, if you could provide a list of parameters specified before.
After you understanding, reviewing, and completing the list of parameters required (posible questions and possible answers, for your bot users), then I could say how much time do I need and how much does it cost.
Depending of what you already have in hand, probably, I'll require support of an additional developer to speed up the building.