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:       Ah , Oh ! Are you hurt ?  
 Person2:I don't think so . I'm just shaken up a little .  
 Person1:        Maybe I'd better call an ambulance .  
 Person2:No , don't bother . I think I'm OK .  
 Person1:        Are you sure ?  
 Person2:Yes , it's OK . 

formal