Update kb.json

kb.json

@@ -1,4 +1,7 @@
 {
+  "hi": "Hello! How can I help you today?",
+  "hello": "Hi there! What can I do for you?",
+  "hey": "Hey! How may I assist you?",
   "If I lack experience in Computer Vision, Machine Learning, or advanced Math, are these courses still appropriate for me?": "Yes, our courses are designed to accommodate learners with varying levels of experience. All that is required is a basic understanding of at least one programming language (Python is preferable but not mandatory). We will walk you through the fundamental concepts, providing step-by-step guidance.",
   "What are the prerequisites for enrolling in these courses?": "To get the most from our courses, you should possess a working knowledge of Python or a similar programming language. For the courses offered in C++, you should have a basic proficiency in C++. Aside from the programming experience mentioned above, the series of courses are designed to take you from the fundamentals in Image Processing and Computer Vision through more advanced topics in Deep Learning. If you are looking to jump in directly to our Deep Learning courses, then you should have a good understanding of the foundational material in Image Processing and Computer Vision.",
   "Will I receive a certificate upon completing a course? What are the requirements?": "Upon finishing a course, you will be awarded a certificate of completion from OpenCV.org. To qualify for the certificate, you must complete all graded quizzes, assignments, and projects, obtaining a score of at least 50%. If your score exceeds 70%, you will be granted an Honor Certificate.",