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: Lisa , can I call Taiwan ?
Person2:Are you homesick ?
Person1: I miss my parents .
Person2:Don't worry about the bill . Just call .
Person1: Can you show me how to make an overseas call ?
Person2:Of course . First dial the code 011 to get an international line . Then you dial Taiwan's country code
Person1: That's 886 .
Person2:Now you should know the rest . Don't forget to dial Taipei's city code .
formal