Can I help you , sir ?   Yes , please . I'm picking out some presents for my children and wife .   What kind of presents do you want ?   Actually , I don't know exactly . Do you have anything recommended ?   OK . How about some very cool sneakers for your children ? Anyway , it won't cost you much . It's only around $ 59.95 for each pair . It might be cheaper than that in America .   Hey , How did you know I came from America ?   Just a hunch , sir .   How much again ?   $ 59.95 .   That's really cheap for shoes like those . OK , I'll take 5 pairs .   Sorry , sir .   Why not ?   Because in this duty-free shop , your total expenditure cannot be over $ 300 and you also have one more present to buy for your wife .   Oh , my God . I've totally forgotten about that . Anyway , I think she would like a bottle of perfume .   That's good . And I can also recommend you a good one . It's the brand of DENY .   DENY ? That's very expensive in America . It costs nearly $ 70 for only 50ml.DKNY ?   It's $ 60 here . 