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:       Er ... Alison ?  
 Person2:Ohm , hello , Marcia . I was ...  
 Person1:        I just wanted to congratulate you ! I mean , it was a good race and you deserve to win .  
 Person2:Well ... thanks , Marcia.It ' s very nice of you to say so . I mean ...  
 Person1:        It was that final sprint ! You were great ! Really !  
 Person2:Do you really think so ? I mean , was I ? Er ... you ... must be disappointed . 

informal