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:       They are professors and government officials .  
 Person2:Where are they from ?  
 Person1:        Most of them are from America and Europe .  
 Person2:What are they doing in Beijing ?  
 Person1:        They are attending an international conference here .  
 Person2:Which hotel are they staying at ?  
 Person1:        They are staying at the Hilton Hotel . 

formal