I had a conversation in english

Yesterday, I went to a party that my friends heldorganized.
I had an opportunity to speak to some people in english.
But it wasn't easy because I couldn't find lots words.

I agree with the corrections above.  I'd like to add that we capitalize the first letter of language names, as we do with days of the week and months of the year.

Example:  I had a conversation in English on Saturday night.

Good work!  I also find that alcohol can make it difficult to speak in different languages, as does loud music.  Sometimes people at parties will speak loosely with a lot of slang, which makes understanding difficult.

Soon your English will be good enough that you can describe a word if you can't think of it!

I had a conversation in english

Yesterday I went to a party that arranged by my friends. held.
I had opportunity that told to some people in english.

There I got an opportunity to speak in english.
But, it wasn't that easy.

Moreover I drank taken alcohol so I couldn't find much time to interact with them.lots words.

Try to write more write-ups in this way to have better language improvement