Retrive sender_id

Hello all. When a person initiates a conversation, I am trying to get the sender id and use it in bot’s reply to greet the user. Is there any way to do so? Any help would be greatly appreciated.

The user logs in into the website and interacts with the chatbot. How can I use this sender_id in bot’s reply?

Something like:

User: Hello

Bot: Hi {sender_id}, how may I help you?

You could customize the action_session_start to take the sender_id from the Tracker and put it on a slot. That way you would be able to use it in your responses.