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:       Hi ! Someone has reported a fault on one of your copiers .  
 Person2:That's right . I'm glad you're here . It hasn't been working properly for the last few days .  
 Person1:        When was it serviced ?  
 Person2:Just a couple of weeks ago . It's usually very reliable .  
 Person1:        What's actually wrong with it ?  
 Person2:Well , it's making a strange noise when we try to change paper trays .  
 Person1:        I'm sure it's nothing serious , probably just a minor fault . I'll have a look at it . 

formal