You can say

Es1 Mi può favorire il biglietto per favore?

oppure

Es2 Biglietto prego.

You don`t usually use "prego" with your friends, that`s why I told you that`s more formal.

ti svelerò un segreto : i treni italiani non sono un granchè neanche d'inverno. Li ho usati per 3 anni per andare all'universita' e lo so bene. A parte il fatto che sono sempre in ritardo, inoltre d'inverno qualche volta non fa il riscaldamento e d'esate non funziona l`aria condizionata.

In più il prezzo del biglietto aumenta sempre di mese in mese. :-s

I told you that you needed to start with newbie ;-)

--R.

 have the same meaning as "qui" and " qua"

"Ecco" is trasated is english as "here", "there", "that's", "this" but there isn't an equivalent word in english.

"Ecco" is used when a person or a thing pops up. Or is used when a fact suddenly occurs.

es: Ecco la mamma = There's my mother.

Ecco il treno che arriva = Here is the train that's coming in.

It is also used as an interjection to strenghen the phrase.

es: Ecco, ci mancava anche questa! = Here we go, this is all we were missing (sarcastic).

la mia insegnante italiana mi ha detto che:

qui=qua=here,ma

li=la=there

chi e' giusto???

li and la are articles! Be careful about the accent! ;-)

"Per favore" when the result of the action you request, is of some advantage to you.

"Sit down, please" could be translated both with "Prego, siediti" and "Siediti, per favore", but they have two very different meanings:

"Siediti, prego" is a kind invitation, like "make yourself comfortable, sit down"

"Siediti, per favore" could be said to a child running around and making a mess. It's like "I cannot stand your running around anymore: please sit down!"

I hope this helps....

Prego and per piacere are not interchangable. If you want to say you're welcome you can say prego or piacere (happy to/my pleasure). 

Other times you want to say, here you are (or a barista at a cafe says: Here you are, your coffee). In Italian in this case the barista would say Il suo cafe', prego.

Per piacere means please. You can say something like, please don't talk! Per piacere, non parlare.

If this is still unclear, let me know.

As for voila and ecco, these two are quite similar when used to mean, here he/she/it is!

For example, I want to know when my friend Giovanna will arrive. I'm talking about her, then I see her coming. I say, Eccola, (here she is!).

This newbie lesson, "Where is She?" features this word, and a discussion of its uses.

Hope this helps!

And "Lei" is you? ´Cause i read it was she...

About prego, as Catherine wrote, it can be used in restaurants by the attendant to say here you are.

If the attendant says just Prego, it can also mean something like "please go on, I'm available, ask what you need". It's not exactly like asking "what would you like to order", but it is commonly used to invite someone to say what they need.

If it's still unclear or you have any other question just let us know! :-)