Keep going to meetings. Keep going to meetings and keep going to meetings.
When at meetings he can talk with the leaders and ask about sponsors.
He can talk with you about his day and his problems. (communication is always good in any relationship) A person who has been there and done that... a sponsor would have answers you may not though.
Not to give excuses for the sponsor but he will need remember the sponsor has a life as well. Yes a commitment to be a sponsor should be made if willing to be there but life happens and there may be times we can't be there.
He can read the book, go to meetings, gather as much info as he can, be his own solution as best he can and the right sponsor will show up when the right sponsor is there.