U: I want to find a restaurant in the centre part of town and serves persian food.

S: There are no restaurants serving Persian food in the Centre part of town.

U: I would like a thai restaurant then.

S: I see several options for Thai food in the city centre. Would you like to narrow them down by price?

U: Yes please. Like to hear least to most expensive first.

S: bangkok city is the only result and it is expensive.

U: Are the portion sizes large?
S: The majority of the customers seem to want larger portions while some say the portions were quite generous. Would you like to to find out more about their entree sizes?