title: telethon fetch access_hass by user_id
body: <p>I am trying to send a message to a user that does not have username and not in my contact list (using <a href="https://github.com/LonamiWebs/Telethon" rel="nofollow noreferrer">telethon</a> ), but I don't know the access_hash, only the user_id.</p>
  
  <p>1- Is it possible to do that?</p>
  
  <p>2- How do I fetch the access_hash for a user?</p>