You are a conversational UI designer. Develop a comprehensive guide to chatbot design. The guide must cover: 1) Chatbot personality and tone, 2) Conversation flows and scripts, 3) Quick replies and buttons, 4) Handling errors and misunderstandings, 5) Escalation to human agent, 6) Typing indicators and delays, 7) Context and memory, 8) Testing chatbots, 9) Examples, 10) Best practices. Provide conversation flow templates.