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:       Hello , what can I do for you ?  
 Person2:I am looking for a host home .  
 Person1:        How long will you stay with the host family ?  
 Person2:Well , at least half a year . Do I have to do my own grocery shopping ?  
 Person1:        Usually the host family prepares at least two meals a day for you .  
 Person2:That is fine . 

informal