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,. I am Anna Johnson. 
 agent: Hello, how could I assist you? 
 customer: I want to cancel my reservation due to family meeting got postponed. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: We found a reservation on your given name. Shall I proceed? 
 customer: Sure. 
 agent: Your cancellation has been done. Thank you for reaching us. 
 customer: Thanks for your help.
Output:
cancel