Export Archive Conversations to PDF File

Hi everybody, 
 
 
 
     I would like to know, if exist how to export the archive scripts of some conversations from OpenFire Server to a PDF file or other format.  
 
 
 
     Currently I can export only one conversation per time. And I need to export a series of conversation. 
 
 
 
     Someone, can I help me?

Thieslei Oliveira