Dear Taras,
Thank you so much for your letter.! It was very nice of you to invite me to your brother's wedding in Lviv. Needless to say, I was delighted with the news
Although there is nothing I would like more, unfortunately, won't be able to make it. You see, I will be away on a business trip in July. I got a promotion last month, which is exciting, but unfortunately, I have to spend a lot of time abroad.
Please give your brother my best regards. One more thing, can you please send me his address so that I can post him a wedding present?
Love,
Daniel