As you say. Thank you, miss. [Maybe that's just how she talks; maybe she doesn't realise Sebastian isn't human... but he likes to doublecheck these things. Not to mention he needs to do some damage control: can't let Stiles completely ruin the Bakery's reputation with his poor people skills. So:]
But until then, would you and your human perhaps like a sample each of something from our menu? [He indicates the pastries on display.] Free of charge, naturally.