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:       Frank ’ s getting married , do you believe this ?  
 Person2:Is he really ?  
 Person1:        Yes , he is . He loves the girl very much .  
 Person2:Who is he marring ?  
 Person1:        A girl he met on holiday in Spain , I think .  
 Person2:Have they set a date for the wedding ?  
 Person1:        Not yet . 

informal