In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details

customer: Hello,. 
 agent: Hello, how can I help you today? 
 customer: I want to cancel my recent ticket booking due to office work that my manager did not approved my leaves, so can you please cancel it? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: My name is Justin Walker. 
 agent: Ok, wait for a while. 
 customer: Sure. 
 agent: Thanks for waiting we found reservations on your name.Shall I cancel your ticket? 
 customer: Yes, please cancel it. 
 agent: Your ticket has been cancelled. 
 customer: Thank you for the help. 
 agent: Thanks for approaching us.
cancel