私の英語は通じない

CustomerA: Hi.
Me: Hi, good evening.
CustomerA: Can I have two ten doller steaks?
Me: How cooked?
CustomerA: ???
Me: How cooked?
CustomerA: ??? Beg your pardon?
Me: How would you like your steak cooked?
CustomerA: ???
CustomerB: How do you want it cooked, rare, medium, well done?
CustomerA: Oh, medium. Rare to medium.
Me: Medium rare?
CustomerA: Yes.
Me: Mash or chips?
CustomerA: ???
CustomerB: Do you want to have fries or mash potato?
CustomerA: Fries.
Me: Any sauce? Mushroom, pepper or red wine?
CustomerA: ???
Me: Would you like some sauce with your steak?
CustomerB: Do you want to have sauce?
CustomerA: Tomato sauce.
Me: Ok, how about you?
CustomerB: Can I have medium well done, chips and redwine sauce?
Me: Chips and salad?
CustomerB: Yes, chips and salad.
Me: Anything else?
CustomerA: ???
CustomerB: Do you want to have bread?
CustomerA: No.
CustomerB: That's all.
Me: Twenty dollers, thank you.
CustomerA: Where are you from?
Me: I'm Japanese.
CustomerA: *sigh*
Me: ...