Mohan, a very emotional piece. I love the many emotions you bring to the table in this poem. I can feel love, sadness, and regret very strongly in this poem. It's so often the case though that after someone we love very much leaves us, we find ourselves not moving forward in life and hoping and holding onto something that may never be again. If this is referring to someone who has passed away, then the poems message changes slightly and you realize that when losing someone, you will either be able to move on and remember the good times, or you will long for what you can't have. One more day with this person and that hinders you from moving on in life.
As for the poem, the poem was a bit out of flow, but I was able to clearly understand your message and see your true emotions you wrote for us.
"Sorry I can not forget you,
because your memories are not soured grapes."
I am curious about the ending. I am wondering if you relate not being able to forget to sour grapes because when grapes ferment it turns to wine and wine helps relieve pain and help us forget? If not this then I am confused by your imagery of the last line. This could be more powerful to those who live where you live though and I could just be ignorant of normalcy where you live.
All in all, I really enjoyed this poem from start to finish. I hope you continue to write and that you learn from that grow as a poet. Great job and keep writing!