This lesson is covered in more detail in Weeks 1 and 7 of Introduction to Sindarin

Being able to say where you come from is an important part of a first conversation with a stranger.
Because Amdiron and Ivrinel are still relative strangers they are still using formal speech with one another in this text.
Amdiron: Suilad! Navan dorthol Ivrinel?
Ivrinel: Dorthon vi Lothlorien, ach onnen hí vi Imladris. A len?
Amdiron: Telin od Imladris.
Ivrinel: Oman tôl?
Amdiron: Siron? Mellonenin tôl o Daur-nu-Fuin
Amdiron: Greetings! Where do you live Ivrinel?
Ivrinel: I live in Lothlorien, but I was born here in Rivendell. And you?
Amdiron: I come from Rivendell.
Ivrinel: Where does he come from?
Amdiron: Siron? My friend comes from Mirkwood.
Vocabulary
Suilad! = Greetings!
Navan dorthol? = Where do you live?
Dorthon vi... = I live in...
ach = but
onnen hí = I was born here
A len? = And you?
Telin o(d)... = I come from. The second word is O before a consonant, and Od before a vowel
Oman tôl? = Where does he come from?

To say 'we live in', use = Dortham vi (and a place).  Take a note of the different ending, but verbs are a much later lesson. For now you should just notice the difference between Dorthon, Dorthol and Dortham.

Formal vs Informal

Formal
(an authority figure or stranger)
Informal
(someone you know well)
Meaning
Navan dorthol?
Navan dorthog?
Where do you live?

Further vocabulary