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 , can I speak to Alice , please ?  
 Person2:Hold on , please .  
 Person1:        Thank you .  
 Person2:Sorry , but she ’ s out .  
 Person1:        Could you tell her Tom Green called ?  
 Person2:I ’ d be glad to . 

informal