491 l'll take care of the bill.
492 Keep the change,please.
493 What is this extra charge for?
494 Do I have to pay for this charge?
495 There's a mistake. I paid for this in cash.
496 My dessert didn't come,but it's charged to me.
497 I think the cost of the free ticket is also included.
498 Ⅰ'll pay the extra.
499 Call the manager please. That waiter is so rude. Ⅰ'm going to complain.
500 Do you have any maps you can give me?
501 Where can I get a subway map?
502 How do you get there? / What's the best way to get there?
503 Could you show me the way on this map?
504 How much is it per person? / How much is one ticket?
505 What's the entrance fee?
"it's charged to me" should be "I was charged for it".