You will be given a definition of a task first, then some input of the task.
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 aid you at this moment? 
 customer: Owing to an emergency, I want to cancel my recent reservation. Can you help me with that? 
 agent: Sure, I am here to help you in cancelling your reservation. 
 customer: Thank you. 
 agent: Can you please provide your name to check your reservation status? 
 customer: My name is Brian White. 
 agent: Wait a moment please. 
 customer: Sure. 
 agent: Brian White, I have found your reservation. Would you like me to cancel it? 
 customer: Yes, please. 
 agent: I have cancelled your reservation successfully. 
 customer: Thank you. 
 agent: Thank you for utilizing our service.
Output:
cancel