Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       What is your most preferred training method ? 
 Person2:Well , I prefer active rather than passive training . For example , I like the training offered by a financial software company from which we bought the newest updated virgin . They sent the programmers to demonstrate how to do and then ask us to practice . All employees receiving this training were in the same meeting room , so we could communicate with each other . We had a lot of fun learning together . It helps to build up the work relation among colleagues . 
 Person1:        Well , that is also very efficient , right ? 
 Person2:Of course , it is much better than just giving us some reading materials or information via the internet . 
 Person1:        That ’ s boring . Once we were asked to watch a video on how to operate the punches , all of us seemed to fall into sleep by the end of the video . 

formal