How to not pattern match

example.ex

defmodule BucklerBot.Handlers.Private do
  use Agala.Provider.Telegram, :handler

  import BucklerBot.Gettext
  require Logger

  def init(opts), do: opts
  def call(conn = %Agala.Conn{
    request: %{"message" => %{"chat" => %{"id" => chat_id, "type" => "private"}, "text" => "/ping"}}
  }, _) do
    conn
    |> send_message(chat_id, "BucklerBot is now working")
    conn
  end

  def call(conn = %Agala.Conn{
    request: %{"message" => %{"chat" => %{"id" => chat_id, "first_name" => first_name, "type" => "private"}, "text" => "/start"}}
  }, _) do
   # Some logic here
  end
  
  def call(conn = %Agala.Conn{
    request: %{"message" => %{"chat" => %{"id" => chat_id, "first_name" => first_name, "type" => "public"}, "text" => "/start"}}
  }, _) do
   # Another logic here
  end
  
  
  def call(conn = %Agala.Conn{
    request: %{"message" => %{"chat" => %{"id" => chat_id, "first_name" => first_name, "type" => "private"}, "text" => "/stop"}}
  }, _) do
   # Another logic here
  end

  #################################################

  def call(conn = %Agala.Conn{
    request: request
  }, _) do
    Logger.error("Unexpected message:\n#{inspect request}")
    conn
  end
end