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:       John got a heart attack last night .  
 Person2:Oh really ? Is he all right ?  
 Person1:        Not so good , though his nephew took him to hospital in time .  
 Person2:Poor old John ! I am ever so sorry . 

informal