Coffee Shop Apology Message to Negative Feedback of Customer

The following complaint was posted on Yelp. As the owner of this coffee shop, you need to respond to it. Using the components of a good apology in this module, compose a better response than the one below.
Yelp Review from Customer:
I have visited many times and had intended to write a good review of this place. I like the coffee and the vibe. So why the one star? Before you publicly denigrate Muslims, you should make sure you understand what you are talking about and make sure the person to whom you are showing your bias is not a member of that group. This happened to me not once, but twice here. Offend me once, shame on you. Offend me twice, shame on me. There will not be a third time. Our neighborhood is wonderfully diverse and accepting. My money is better spent in places that uphold that great vibe. Enough said.
And the badly written apology from the Coffee Shop Owner:
Response from The Coffee Shop Business Owner
First let me apologize if you ever felt discomfort while visiting The Coffee Shop. It is not in our nature to put down any group of people. We do however encourage conversation about any topics which include religion, politics, aging etc...between our customers and staff with anyone joining in. The reason we opened our shop in this area is the diversity of peoples and the gifts each one brings with them. That being said you have given us much to think about.
This does not have the elements of a good apology. While the owner apologizes, he also states “. . . if you ever felt discomfort visiting the Coffee Shop.” But the owner is well aware that the customer felt more than discomfort. It does not assume responsibility, let people know what he is going to do about it, or make people reading this feel comfortable to come back to his shop.
So you are to compose a better response apology to this situation.
After speaking with your baristas about this, you understand the situation to be that two of your baristas were conversing about Muslims while behind the counter. This customer heard one of them make a derogatory comment about Muslims. In composing the response discuss your reaction to this, your appreciation of the neighborhood diversity, and what specifically you are going to do to remedy this.
You may want to invite the author of the complaint back into your coffee shop. But I wouldn't offer any free coffee or food (that could cause more people to complain about your shop in order to get free coffee etc) but you can provide your contact info and suggest she contact you so you can speak to her further. Then in person you could offer to comp her order.
You can use your name as the owner’s name in your response and post it to the Revised Bad Apology Discussion Board. Keep it in the format of a Yelp review - one paragraph, using the name of the person you are responding to and signing off with your name.
Here are components of a good Apology:
Give a detailed account of the situation – repeat the concerns/complaints expressed by the customer
Acknowledge the customer's hurt/ damage/disappointment
Take full responsibility; recognize your or the company's role in this if you are at fault. Admitting fault (saying you are responsible or you are sorry) can be seen as admitting fault and can cause legal problems.
Include a statement of regret if you are at fault. If you are not at fault, you can still include a statement that empathizes with the customer(s).
State what you are doing to fix the problem(s)
Please check the attached file to see the apology guidelines along with two example