Change username into existing one

Hello.

As I asked in the #launchpad irc channel, I want to change my username from "sinednx" to "dnx" in lp. Because I own everywhere this account name (irc, github, bitbucket, etc.) and I noticed that "dnx" account isn't active in lp.

As suggested by <czajkowski> on the #launchpad irc channel, I wrote a message using "Contact user" form here in LP to RoMiONeT (https://launchpad.net/~dnx) over a week ago and have had no response so far.

Do I have any chance to have "dnx" account name?
Thank you!