These things can happen when you're not paying attention.
[color:"orange"]how on earth can anybody suspect that he has to give a bottle of ale to the dwarven major?[/color]
There's mention of bringing the mayor ale in the dialog, unless there's another path that doesn't make it as obvious. The first time you talk to him he says he wants to share a drink with you. Every time after that he asks if you brought him anything to drink.
[color:"orange"]Also the first picture of dwarven member is misleading.[/color]
The character says he can't identify the dwarf or his location. Zandelor suggests you scrye for him again later.