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:       Do you have any plan on your mind ?  
 Person2:I want to see all places of renown in Suzhou .  
 Person1:        How are we going there , by bike or by bus ?  
 Person2:By bike , of course.You don't want to miss the beautiful scenery , do you ? 

formal