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:       Hey , Ann , I am really sorry about last night . I shouldn't have said those things to you .  
 Person2:I am sorry too . I know we've been talking about this beach trip for a while . I should have told Bob I was busy this weekend .  
 Person1:        don't be silly . You guys should spend as much time together as you can . Besides we can go to the beach anytime .  
 Person2:thanks for understanding .  
 Person1:        well that's what being friends is about , isn't it ?  
 Person2:hey , what if the three of us go to the beach together ? Besides , you and Bob haven't seen each other for a while . I don't want my best friend and my boyfriend to be complete strangers .  
 Person1:        Nah , I wouldn't worry about that . But I don't want to be the third wheel . You two should have some quiet time to yourselves .  
 Person2:I know Bob won't mind . You can bring a date , like that guy from the bar you keep talking about .  
 Person1:        maybe ... I'll think about it . 

informal