The only way to guarantee that it will absolutely not happen is to have some kind of lock or use the task reschedules itself option which would amount to polling. You can use the web2py included portalocker. Frankly I would go for a much simpler solution, just clearly differentiate between chatbot and scheduled communications, maybe put a big text header clearly marking the latter ones. Then it won't matter that they come in the middle of the conversation, it will probably be a rare occurrence anyway.
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