<prompt> Human: Hi there!I hope I can explain myself well.. I am not sure what this is called other than a receipt... Its when youre dining out or where ever and the place makes you sign a paper. Along with that paper is basically another copy of the paper but usually it says customer copy. What do you do with this copy? Do you guys tend to actually fill it out for your own safe keeping? How is this considered reliable in terms of tipping? What if the worker says Sorry, we cannot find the original receipt and I only have my own copy to work with... There hasnt constantly been an option or I just havent tried hard enough to get a receipt that also has the tip printed into it. Any advice?  <response>: I leave it or throw it away unless Im being reimbursed for the meal. It serves no purpose to me. 