The story is actually very interesting. Not sure there is a reason to explain where the person didn’t show up. The context explains it. I think you might want to consider shortening your sentences. At this level focus on trying to say what you want to say in short sentences. If I had not given her the gift, I don’t know how she would have felt/ reacted/ what she would have said. Might be better option that what might have happened as it is confusing. What might have happened? A refresher in conditional tenses is needed. 1. If you give me some time time, I will reply to you. ( future) 2. If I won a lottery, I would buy a big mansion.( future use) something unrealistic, you are dreaming about 2. If I was a man, I would do boxing ( present use) something that refers to presence but it is just not true assumption -I’m not a man. 3. If you had read it one more time, you would not have made some of these mistakes. ( past)