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:Have you any package tour to Italy ?  
 Person1:        Yes , of course . Here are all the tour routes we have to Italy .  
 Person2:How long does the route No . 5 last ?  
 Person1:        2 weeks . Is that OK ?  
 Person2:We have just 10 days for the vacation . 

formal