婉拒海外朋友的假期邀请Declining overseas friend holiday invitation

Dear Peter, I hope you are well and the reason I am writing is to respond to your kind offer. Let me start by expressing my gratitude for the offer to stay with you over the Easter holidays. It was also very kind of you to offer to pick me up from the airport. I miss you so much so it is with deep regret that I cannot come this year. As to the reason I am unable to visit you, it is because I promised my sister I would stay in town and help her renovate her house. She bought the house last month and wants me to paint the walls and replace the carpet. I made this promise before receiving your kind invitation. I also want to let you know that Steven got promoted to Sales Manager. My even bigger news is that Steven and I are going to get married in March. I hope you can come here and join us for this special occasion. Please let me know if you can come at your earliest convenience. Best wishes, Sarah