I was supposed to meet a date from online dating for drinks tonight. Not super enthusiastic but figured it was worth trying out because who knows. Anyway, my boss just came in and told me that I should add a few more things to our meeting/presentation tomorrow... and I don't think I have time to go on this date if I want to get that done. Is there any polite way to cancel? Even though I am not super enthusiastic about it, I feel bad canceling.