What a great topic, @iyudhi. I view this the same way that @WilfriedB did. The phrasing might be a little misleading, as might the context of where the sign is located.
If the Cafe hopes each customer receives 5-star service, are they also asking whether they’ve earned it? Did they try to initiate a conversation with you about how they did and what could be improved? This is simply a mission statement and a call to action rolled into a single flyer.
There are many customer feedback programs available that will ask for opinions via email to gather details about a visit. If the customer had a positive experience, they will be redirected to the Google Business page or Yelp; otherwise, the company will notify the customer of a follow-up to correct any negative experiences. This is the context of how I see this type of sign.