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 , Rachel . It's glad to see you here .  
 Person2:Hi , Ross . Glad to see you , too .  
 Person1:        I'm going to throw a party tomorrow night . Would you like to come ?  
 Person2:A party ? Yes . I'd love to . Thank you for inviting me . Will Monica come ?  
 Person1:        Of course .  
 Person2:That's great ! What time will it start at ?  
 Person1:        At 6 o'clock .  
 Person2:OK . I'll come . See you then .  
 Person1:        See you . 

informal