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:       Hello , Betty , how are you ? 
 Person2:Quite well , Tom.And you ? 
 Person1:        Just fine , thank you.How ' s your father today ? 
 Person2:He's much better today . 
 Person1:        I'm glad to hear that.Bye . 
 Person2:See you later . 

informal