Dear Paul,
Thank you very much for your invitation. I would really like to play in the Peoples Park , which will reopen next Sunday, but I will have to pick up my uncle at the airport in the early morning.He has been studying in the USA for three years. Whats more,I have promised Paul to learn to swim in the swimming pool and enjoy 20xx,which is said to be a wonderful movie.I am very sorry about your invitation. I think our classmate Anna can take my place to be your guide.She knows a lot about the park.I will give her your email address so that you can make a detailed schedule about the activity.I wish you had a nice day.
yours,
