"Saisinko..." vs. "Haluaisin..." use
Is there a 'normal' for when one uses saisinko vs. haluasin in a sentence like, "Saisinko/Haluaisin jotain juotavaa ?/."?

Thinking of English, "Can I have" it is a direct request, you want something right now. But using "I would like" you may be making a polite request, or you are stating a general desire. E.g.:
Can I have something to drink? -- you want something to drink, now
I would like something to drink. -- either you are saying you do want something now, or you are saying in general you could use a drink

Is there a similar implication in Finnish?

Thanks

Question

"Saisinko..." vs. "Haluaisin..." use
Is there a 'normal' for when one uses saisinko vs. haluasin in a sentence like, "Saisinko/Haluaisin jotain juotavaa ?/."?

Thinking of English, "Can I have" it is a direct request, you want something right now. But using "I would like" you may be making a polite request, or you are stating a general desire. E.g.:
Can I have something to drink? -- you want something to drink, now
I would like something to drink. -- either you are saying you do want something now, or you are saying in general you could use a drink

Is there a similar implication in Finnish?

Thanks

Answer

A non-native 2 cents here,  "saisin" sounds polite ( for example when you want to pour wine in a friend's glass, you can ask "Saako olla?" if you want to be polite),  in English  "Saisinko jotain juotavaa" would be like " May I have something to drink" . 
On the other hand, "Haluasin" is simply "I would want" which might not be polite but it depends on the context, when in doubt use the first.

Ne manquez pas cette occasion d'apprendre une langue depuis chez vous. Découvrez notre sélection de professeurs de langues expérimentés et inscrivez-vous dès maintenant à votre premier cours !