请高手帮忙分析一下下面这段对话的意思.谢谢
Suddenly I realized I was so lost in thought I’d missed the road leading to the school and was headed back toward town. How could I have done such a thing? I turned into a side street and found myself stopping in front of a Victorian house. The big bay window was filled with twinkling lights. On display was a shiny red and black electric guitar. This was a music store! And the guitar was the very one Shawn wanted. A middle-aged woman welcomed me as I entered. “Anything in particular?” she said. Somehow I couldn’t help myself. She was a complete stranger, but I opened my heart and told her what I was going through. “Christmas would really be Christmas,” I said, “if I could buy that guitar in the window for my son.” I offered her five dollars as a deposit and promised to pay in full with my tax refund after the new year.
