Just to clear my doubt Please let me know
Is asking for a feedback is wrong??
You answer may be helpful and give me more information about the forum
It depends. If you did not trade its certainly wrong.
If you did trade the other party might not want to leave a positive rating because the understand they trust system as a trust system and not as a trading feedback system. If you have a rep thread in the corresponding section[1] it would not be asked too much to request a short post there.
[1]
https://bitcointalk.org/index.php?board=129.0