Task-oriented dialogue about: restaurant

Hi, I am looking for a place to eat in the centre of town.
I've found a lot of restaurants in the centre. Is there a specific type of food you're looking for?
It should serve portuguese food in the cheap price range.
Nandos City Centre is your place. Would you like to book?
Yes, I need a table for two on Wednesday.
What time on Wednesday would you like?
Book it for 15:30 please.
That time is not available.Would you like a different time ?