Gather Chat is a complimentary Google Forms add-on that you can utilize to turn a Google Form into a chatbot. With the add-on installed you simply have to open a Google Form then open Collect Chat and pick to transform the form into a chatbot. Either way, visitors viewing your chatbot will see the exact same concerns as they would if they saw the Google Form straight.
While Collect Chat itself is easy to use, it would take a bit of preparing to make an effective chatbot by means of Google Forms. If you want your chatbot to actually engage with user input you would need to develop a relatively long Google Form that accounts for a variety of responses from users.