Jehovah's Witnesses believe that the conversations between God and the people are carried out by angels, but the angels are not mentioned in the Bible. They are merely assumed to be present, because no one has seen God. How accurate are the angels as messengers? Is it assumed that the angels carry God's word word-for-word or paraphrasing God's words?
This could probably be a lengthy answer, but it would be better to summarize one core belief, which should easily answer the remainder of your question.
Jehovah's Witnesses believe by a number of scriptural proofs that Christ himself is an angel, the highest ranking one, and he is the primary means that through which the speaking between God and man occur.
Since "angels" are the subject here, there is for instance Jude 1:9 [Amplified Bible]:
This of course is stated on the basis that Jehovah's Witnesses understand that Michael is the same person as "Jesus" (Michael being his pre-earthly angelic name).
Contrast this to how God himself deals with Satan's taunts regarding one of his servants in the first chapters of Job - the reaction is far more authoritative and altogether different. Simply, there is a stark difference between how God (not an angel) and Jesus (an angel) deal with Satan's challenges.
So if Jesus, the "Firstborn of creation" (Proverbs 8:22) is an angel, and he is also called "The Word", the primary means of which God's word is transmitted to us, then that is probably the first and foremost answer to your question.
Then there is Hebrews 2:2:
Without a complicated run-down of every scripture, Jehovah's Witnesses understand that God's angels are very obedient (indeed perfect) and just like human copyists of scripture, have transmitted messages exactly as directed. Of course Jehovah's Witnesses do not put a huge amount of undue attention on angels themselves, and follow the example angels set in directing glory go God alone. Revelation 19:10:
In a looser sense, the word angel also means "Messenger" and indeed many messengers are involved in the transmitting of God's word - including humans in the spreading of the word throughout the earth.
I have no doubt that there is a more complete answer than this to be made, but this is a general overview. Its most important to state that Angels are not the focus of JW beliefs, and they do not receive undue attention.
I have been one of Jehovah's Witnesses for over 30 years. Here is a short answer in my own words:
The bible sometimes says things that God did, but really means that he was the 'architect' of that action but had a 'laborer' actually do that action.
For instance: Genesis 1:1 says that God created the heavens and the earth. But later in the bible (Colossians 1:16, 17; John 1:3, 10; Hebrews 1:1, 2) it gives more detail showing that he used his son Jesus as a "master worker".
So, with regards to God speaking through angels... In Exodus 20:1, talking about the Ten Commandments, it says “God proceeded to speak all these words.” But, later in the bible (Galatians 3:19) it says “It was transmitted through angels by the hand of a mediator.”
So, it seems likely that other times when the bible says that God spoke something, it may have been through an angel also.
Here is the long answer from the 1990 Watchtower:
I am one of Jehovah's Witnesses. It sounds like you are asking if we believe that angels will walk up to us and give us messages from God. That is not one of our beliefs.
Here is an excerpt from one of our publications:
If you want to know what we believe there are only two ways to find out: