Extracting custom entities from user input

[Arun Mani Varughese]

I want to extract a custom entity called botname from users input. For example consider the conversation:
Bot: Please enter your botname
Me: My bot name is arunBot
Or
Me: It is arunBot
Or
arunBot etc

There can be multiple ways in which the user answers the question right. Sometimes user will type just the answer or he may type the answer in some random sentences. Also this botname is not something that is fixed(botname can be anyname). I need to extract this botname from user input

How to tackle the situation ?

[Author]

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