Hiccup understood very little of what the guy behind him ordered, but recognized at least that his name was Adrian. Once payment had been sorted out - the plastic card still baffled him a little - he turned to the other guy and listened to what he was saying. He missed a couple of words here and there, but the general feeling of thanks was definitely understood and Hiccup smiled widely.
"Helped. I forgot. My English...not so good." Which was an understatement, but he was trying. He wanted to be able to communicate with others better. Maybe he'd ask those who spoke Norse to help teach him English as well. That could potentially help. "Thank you."