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:       Hi , waiting for the bus ? Where are you going ?  
 Person2:China Hotel .  
 Person1:        Why don't you take a taxi ? It'll get you there much faster .  
 Person2:Well , I think I'll take the bus this time just for a change . 

formal