I do understand that tag lines are very important when you are planing to build a brand. With my experience I am confident that I will be able to provide not only a tag line but a customer magnet. The Only thing I would need is the name of your cafe along with what kind of an ambiance you are providing for your customers (if possible, a few clicks). Using these information, I will be able to provide you with the tag line that you are looking for.
Example:
>> Sip the GOSIP!!!
>> Leave the Stress Behind...
>> Have a WORLD CUP of Coffee!!!
Hoping to work with you.
Regards
Moinak Dutta.