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:       May I help you ?  
 Person2:Hi , this is Sharon in Mr . Reynolds ’ s office . One of your delivery men picked up a package here about an hour ago .  
 Person1:        Yes , is there a problem ? Ma ’ am ?  
 Person2:Well , it still hasn ’ t reached its destination . I wonder if you could track it down for us . Mr . Reynolds is a bit concerned . 

formal