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:       Oh great ! This stupid computer froze again ! That's the third time today ! Hey Samuel , can you come take a look at my PC ? It's acting again . It must have a virus or something . 
 Person2:I ran a virus scan on your computer , and it turns out that you have a lot of infected files ! 
 Person1:        But I'm quite careful when I'm browsing the internet , I have no idea how I could have picked a virus . 
 Person2:Well , you have to make sure that your anti-virus software is updated regularly.yours wasn't up to date , that ’ s probably what was causing your problems . 
 Person1:        Ok . Anything else ? 
 Person2:Yeah , try not to kick or hit the computer ! 
 Person1:        Um yeah.Sorry about that . 

informal