"I want to thank you."

Translation: Mi volas danki vin.

[RomajiAmulo]

but I can't. Sorry!

[cd1]

...fot giving me the best daay of my liife...

[_Venko]

Why is the vi not accusative in this question's answer? Is "you" not the object being acted on?

[Ariaflame]

I'm seeing 'vin' there, so maybe it's been fixed.

[salivanto]

Unless he/she was seeing "Danki al vi" as an alternative.

[Hxvan]

But Why vi is in accusative?. How can volas danki be transitive?

[salivanto]

You use the -n ending with the noun that receives the action of the verb. When you thank, you thank someone. The person being thanked is the object. It can also be done with a direct object.

Mi volas danki vin

Mi volas danki al vi

are both correct and both common.