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:       Where do you spend the weekend ?  
 Person2:We've a country house .  
 Person1:        That's nice .  
 Person2:Join us , will you ?  
 Person1:        That'd be great ! Thank you . 

informal