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:       Can you skillfully operate the computer ?  
 Person2:Yes , I can . I have three years experience in operating computers .  
 Person1:        What kind of software can you use ?  
 Person2:I can skillfully use Dos , Windows .  
 Person1:        Do you have any certificates on computer ?  
 Person2:Yes , I have ACRE certificate , rank 2 .  
 Person1:        Any other certificates ?  
 Person2:Yes , I have a Cambridge Business English Certificate and Lawyer ’ s Qualification Certificate .  
 Person1:        Do you have any other special skills ?  
 Person2:I like photography very much . I used to be awarded second prize in a photography contest at our university . 

formal