You've got several options, and what works best will depend on where your clients prefer to engage with you (ex. email, phone, social media, live chat, etc.).

We’ve all seen them: pop-up messages or slide-in CTAs that appear as we scroll through an article or open a new page. Why not put these tools to good use and ask your customers a question or encourage them to fill out a survey? You can even offer them an incentive to give feedback like a free downloadable whitepaper.

An even more instant option, live chats are a great way to get the conversation started in real time. While live chats are an ideal outlet for customers to ask you questions, you can also use this feature to send a few their way. Maybe the chat box pops up when they visit your site and asks how they found your business or what they are looking for. It’s like a two-for-one sale where you can improve their experience and collect feedback.

Here are more tips on how to ask for and use customer feedback: http://www.fieldboom.com/blog/customer-feedback/.