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:       Are you from America ? 
 Person2:No . I am Canadian . Are you Chinese ? 
 Person1:        Yes . Nice to meet you ! 
 Person2:Nice to meet you , too . Let me show you around . 
 Person1:        Thanks , I will appreciate it . How long have you been here ? 
 Person2:About two years , but it seems as if I got here yesterday . 

formal