Trigger: as I'm building a whatsapp chat bot... I only want my chat bot to trigger a conversation ONLY when the customer message me containing a certain phrase... like... "Hi, BOT, " The standard message coming from the customer is always like "Hi, [name], i'm interested in blah blah blah... from the link.... blah blah blah.... etc"... So I want the chat bot only replies when it see a message like "Hi, [name]," and then it will gather information based from this message and grab data from an excel sheet in my onedrive (like knowledge base) and reply. How do I go about doing this?