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'.

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