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 , this is Dr Cook's clinic.May I speak to Mr.Smith ?  
 Person2:This is he .  
 Person1:        Dr Cook won't be able to see you at the time suggested.Could you make it a quarter to two ?  
 Person2:All right . 

informal