Dear Joanna,
How are you? I hope you're well.
I write to you because I have a big problem. I'm so upset and I don't know how can I tell it to you. Unfortunetly I couldn't stay with you at your home for a week in June. My grandmother is so ill and I can't leave her alone. Of corse my mum and my grandfather can care about her but they have a lot of obligation and I ought to help them. I'm afraid that you are angry on me but it isn't my fault. I'm terribly sorry I know that you could think that I'm irresponsible person. But I have new idea. maybe you could arrive to me in July? I can show you how Warsaw is beautiful. My family thinks that it's great idea and they're waiting for you. I want to write a letter to your parents and asked they about their opinion. I miss you and I wait for your answer.
Give my regards to your family,
M.