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'.
Q:  Person1:       Well , it was nice meeting you .  
 Person2:Yes , I hope we meet again .  
 Person1:        Sure , I'll give you a call .  
 Person2:Okay . 
A: 
informal