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:       You must be Wily . It's nice to meet you .  
 Person2:Nice to meet you , Mr . Wilson .  
 Person1:        Tim , please . Please be seated .  
 Person2:Thank you .  
 Person1:        So , Wily , you have been with IBM for two years ready for change ?  
 Person2:Well , I think I'm ready for new challenges . 

informal