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 , may I help you ?  
 Person2:We'd like to take a tour to Florence .  
 Person1:        That's a beautiful city . When do you want to go there ?  
 Person2:We have got a 2 weeks ' vocation and we plan to leave on Thursday .  
 Person1:        Then please have a look at the table , there are so many plans . 

formal