title: How to send message to the user by using telegram id and python_telegram_bot library?
body: <p>I want to send the message to anybody by using his telegramid and python_telegram_bot library.
  I can send the message to me by using below code but if I put other's id then I can not send the message and it says <code>chat not found</code> message.</p>
  <pre><code>updater = Updater(mybot_token, use_context=True)
  updater.bot.send_message(chat_id = receiver_id, text=&quot;welcome&quot;)
  </code></pre>
  <p>I am not sure why it is only possible to send the message to me, not the others even though I puth the chat_id as their telegram_id.</p>