Reports: add a report that shows all guests' contact information

I would like to let all my customers know that I have a direct marketing site and push them towards this site if they rebook. But I need an easy-to-use list of contact details to create this marketing push. I could do this via SMS if I can have a list of all customers and their phone numbers. I could also use this to let previous customers know about discounts once we can do that via direct booking.