How to hang up the calls before calling AGI script?

I am new to asterisk. I had a below configuration in my extension.conf file.
I am hang up my call before AGI script executing (Ringing) then my call has got disconnected but still channel is occupied and AGI script is running in asterisk CLI.

I want to know how to hang up the AGI script execution while after my call has disconnected?

If I disconnect my call in ringing event, call has disconnected. But Asterisk is not receiving my hangup signal and my AGI script is started to executing.

How can I hangup the call without Answer() function?

exten => s,1,Ringing
exten => s,2,Wait(8)
exten => s,3,AGI(‘’)

Thanks in Advance