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: Hi. 
 agent: Hello. How can I assist you today? 
 customer: My business trip got cancelled, can you please cancel my recent reservation? 
 agent: Sure, may I know your name to check for the previous reservation? 
 customer: I have reserved my flight ticket in the name of John Young. 
 agent: I found your reservation and successfully cancelled the reservation. 
 customer: Ok, that's good. Thanks for your help. 
 agent: Thank you for contacting us.
Output:
cancel