Easily gather all the information you need to know how to help them improve their marketing. They may be spending money too much money on Adwords for too little results, and you may be able to help manage their Adwords.
Or you may be able to help with their website or fix a problem with their mobile site, or improve their website security, or develop videos for them, or help them claim or optimize their Google My Business page, or any number of other ideas.
These businesses will always be interested in other ways they can improve their bottom line!