U: Could you find me a cheap restaurant in the centre please

S: I have 15 in the centre. Did you have a food type preference?

U: Is there one that serves chinese food?

S: There are three Chinese restaurants. They are charlie chan, rice house, and golden house. Does one appeal to you?

U: Do you know which of those three has the most highly rated Ma Po Tofu?
S: Of the three choices, the only reference to Ma Po Tofu was from a customer at Golden House and they loved the dish. Do you have any other questions I can help you with?