withdrawal from asylum process is fairly simple . you dont need to do much just write a one line letter to the judge advocate of your court and let him know that you wanna discontinue . authorized sign is crucial. here goes sample letter .

Mr.XXXX.
( senior judge, or whatever )
( adddress )

Please discontinue my pending asylum case.

Truly
( your name )
SIGN ( mandatory ) .

you can elongate letter as much as you like/ can but this is not an IELTS exam and you wont be graded.