Could you book a city tour for me?
'Prenotarmi' — stress 'pre-no-TAR-mi'. The R is rolled slightly in standard Italian.
Ask the concierge to arrange a guided tour. Concierges often have preferred guides and can negotiate better rates or ensure quality.
'Potrebbe prenotarmi' = 'could you book for me'. 'Prenotare' (to book/reserve) is an essential word for Italian travel. The indirect object pronoun 'mi' is attached to the infinitive.
Avete brochure sui tour locali?
Do you have brochures about local tours?
More exploratory, before committing
Quanto costa un tour guidato?
How much does a guided tour cost?
Asks about price first
C'è un tour in inglese domani mattina?
Is there a tour in English tomorrow morning?
Specifies language and time
Italian hotel concierges often have personal connections with local licensed guides (guide turistiche autorizzate). Licensed guides must pass official regional exams and are significantly more knowledgeable than unlicensed 'abusive' guides.