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:       Good afternoon , Mr . Anderson .  
 Person2:Good afternoon , Miss Li .  
 Person1:        How nice to see you again !  
 Person2:Nice to see you , too .  
 Person1:        It's been a long time , hasn't it ? How are you ?  
 Person2:Fine , thank you . And you ?  
 Person1:        Very well too , is there anything I can do for you ?  
 Person2:Yes . Could you guide me to where I can change money ?  
 Person1:        Sure , Mr . Anderson , please come along with me .  
 Person2:Thank you .  
 Person1:        My pleasure . 

informal