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:       Good morning . Could I speak to Frans Smith please ? 
 Person2:Frans Smith ? I think you may have the wrong number . 
 Person1:        Is this Taiwan 8234342 2 , DS engineering ? 
 Person2:It is . But there is no Frans Smith here . Do you know which department he works in ? 
 Person1:        The accounts department , I think . 
 Person2:The accounts department , no problem . I'm just putting you through now . 

formal