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 , I want to make a reservation for a Qingdao cruise .  
 Person2:When will you set out ?  
 Person1:        Next week .  
 Person2:OK . There is one on Wednesday .  
 Person1:        Good ! How much does the sea view stateroom cost for per person ?  
 Person2:Eight hundred yuan .  
 Person1:        I see . Does that include fees for shore excursions ?  
 Person2:No . It doesn't . But it includes all other on board activities .  
 Person1:        Thanks a lot . Give me one ticket , please . 

informal