初めての英会話だったのですが、話題を沢山出してくれて、会話が途切れることがありませんでした。また分からないことにもとても優しく丁寧に、根気強く教えていただきました。ありがとうございます Even though it is my first time that I take your English conversational lesson (or session), I am glad that you gave me a lot of topics so that we had smooth communication. In addition, you patiently and generously taught me about what I have trouble to understand. Thank you very much. Or in the second sentence, you may also say: Thank you very much for your patient and generous teaching about what I do not understand. DJ's translation may lead a little misunderstanding　because of no comma And in the part that I didn't understand I get a nice and patiently teach. Thank you. which means: その一部分で、わたしが親切かつ根気づよく教えてもらえることが理解できなかった。 または 私が理解しない部分では、わたしは親切かつ根気強くおしてもらえる。

self_correction: especially the time tenses. Even though it was my first time that I took your English conversational lesson (or session), I am glad that you gave me a lot of topics to talk so that we had smooth communication. In addition, you patiently and generously taught me about what I had trouble to understand. Thank you very much.

Thank you so much, DJ! I really appreciate your immediate help. :)

I think it translate like this. Even It was the first time of having English conversation, and don't have many topics but the conversation going smoothly. And in the part that I didn't understand I get a nice and patiently teach. Thank you.