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 . Overseas operator . May I help you ?  
 Person2:Yes . I'd like to make a collect call to Japan .  
 Person1:        Your name , please ?  
 Person2:It's Helen Kent .  
 Person1:        Who would you like to talk to ?  
 Person2:I'd like to talk to Mr . Edna Kent .  
 Person1:        Is that Mr . Edna Kent ?  
 Person2:That's right .  
 Person1:        What number are you calling from , please ?  
 Person2:From code 513 , 432-6748 .  
 Person1:        And the number in Japan , please ?  
 Person2:Country code is 81 , area code 138 , and the number is 846-8972 .  
 Person1:        Hold the line , please . I'll put your call through . 

formal