How to make sure that the bot does not lose the “thread of the conversation”?

Question

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A bot is being developed. How to make the bot understand that it is talking to the same person and not a new one? For example, how to make such a conversation?
B: Hello, send me your number
C: 1951023
B: oh, it doesn't fit, try again
C: 112321
B: Now it does!
but in reality it turns out
B: Hello, send me your number
C: 112321
B: Sorry, I don’t understand this command

Answer 1

1. Store states in the database.
2. Store the user profile in the database.
The question has been asked many times. All the answers have been there for a long time
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