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:       Good morning .  
 Person2:Ah , hello . Do you have a service for buying Traveller's Cheques ?  
 Person1:        Yes , we do . How can I help ? I can give you a simple introduction , if you'd like ?  
 Person2:That would be wonderful .  
 Person1:        We usually recommend our clients buy US Dollar Traveller's Cheques , as they can be exchanged for local currency all over the world . They are certainly the most versatile .  
 Person2:But what if something happened to them ? What would happen to my money ?  
 Person1:        As soon as you purchase your Traveller's Cheques from us , you are covered . No matter if you lose them or they are stolen , we will replace them promptly . All we ask is for you to write down the reference number of each cheque and keep it in a safe place away from the actual cheques . We will need that number if you need to make a claim .  
 Person2:OK , I'd like to purchase 500 US dollars worth of Traveller's Cheques , please . 

formal