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:       Excuse me , are you American ?  
 Person2:No .  
 Person1:        Do you speak English ?  
 Person2:A little , but not very well .  
 Person1:        How long have you been here ?  
 Person2:2 months .  
 Person1:        What do you do for work ?  
 Person2:I'm a student . How about you ?  
 Person1:        I'm a student too . 

formal