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:       It's very cold tonight !  
 Person2:Can I get you another blanket ?  
 Person1:        0h , that would be nice of you .  
 Person2:I'll turn the heat up .  
 Person1:        Yes , please do that . 

informal