Asking for permission

Andreu : There's a extreme theme park on Sunday.

Dad : Really, how much is it ?

Andreu : It's free! It's Ferran's birthday. Please, Dad !

Dad : I suppose so.

Andreu : Thanks. And can I buy Ferran a new bicycle for his birthday ?

Dad : No, sorry, you can't.

Andreu : Why not ?

Dad : Because it's very expensive !

Andreu : Yes, you're right.