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:       Is this the first time you've come to our city , Mr . Ross ? 
 Person2:Correct . I have expected to visit here for a long time . So fortunate for me , I can realize this expectation and meet you , Arden , and your kind-hearted staff in your company . 
 Person1:        I am so honored to hear that . Well , after staying here for several days , you must have some ideas about our company . We have been in the clothes field for many years , and yours brand is also well-known in the country . How about our cooperation ? 
 Person2:That is one of reasons why I am here now . I am really willing to have some cooperation with your company . 
 Person1:        We intend to establish business relationship with your company on the basis of equality and mutual benefit . 

informal