Translation of guirnalda

I hope you you had a successful week in Dortmund. Because of the bad weather at the last moment I could not get on my flight to Dusseldorf and I have stayed home. I was afraid to fly.
I think I have told you that I won't charge you for this kind of help. I looked at the sentences and I found them a little too long. They were good, but I understand why it took you so long and I think the point is too keep the shorter.
What are you studying? Maybe we can write emails to each other in English or German. Thank you for your e-mail which I have received on Vocabulix just now. Write me if I can help you in learning German.