Verb conjugation of "join" in English

Mr. Kohler, Ms. Johansen, in June I will be in Darmstadt for several days and would like to meet you both. Are you in the week of June 16 to June 20 in Germany? I think I also bring gifts.
I am a computer scientist and I also have a small restaurant with my younger sister (she is also already 53). You can come and visit, I will buy you a drink and we could chat a little.
Absolutely no problem, do you speak English? I'll help you to learn it and you will like it. Your English is really very good, I understand all your lyrics, and please accept my friends request.