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:       Hello , Is this EYE computers ?  
 Person2:Yeas , It is.Sewen Jes speaking.How can I help ?  
 Person1:        Actually , I'm calling to complain about your service . The computer I bought last week is faulty .  
 Person2:Oh , I'm sorry to hear that , sir.What exactly is problem ?  
 Person1:        Well , easily , It doesn't work . It doesn't even start probably .  
 Person2:Oh , dear ! I'll do well I can . 

informal