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:       The answer for number 6 is C , 7 is B , 8 is A ...  
 Person2:Ms . Lee , could you tell me what number 7 is again ? I didn't catch you .  
 Person1:        Sure . 7 is B . Any others ?  
 Person2:No , thank you . 

formal