if they are tour customers, old people also will come. some old people will not understand what it is "アメリカーノ". so you should call it just コーヒー coffee. and just in case, you need to tell "which is 無料 free(included), which is 有料 charged" clearly. however even if you tell it, some old customers will not hear it, then they will ask to you again. haha..
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