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:       You are friend of Janet , right ? I am Andrew , Andrew Smith .  
 Person2:Nice to meet you , Andrew . I am Noirin , Noirin O'Neil .  
 Person1:        I'm sorry , I didn't quite catch that .  
 Person2:Noirin , N-O-I-R-I-N , it's an Irish name . 

informal