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:       So , Is this your first time to TAIWAN ? 
 Person2:No , I first came here 1995 . 
 Person1:        Oh , really ? And you are from the State , right ? 
 Person2:Well , I am from Canada . Actually . 
 Person1:        Oh , I am so sorry . 
 Person2:That ' ok . That's happens all the time . 

formal