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:       Mr . Wilson , here's a present for you . 
 Person2:Oh , you are so nice . What a lovely scarf . 
 Person1:        I hope you will like it . 
 Person2:Of course , I like it very much . Thank you . 

informal