Definition: 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
Input: customer: Hello. 
 agent: Hello, how can I serve you? 
 customer: I am Jennifer Lopez, I want to cancel my ticket as my I want to visit New York is cancelled to my illness. Can you cancel the flight ticket which is on my name? 
 agent: Sure, please wait a while I will check and let you know. 
 customer: Sure. 
 agent: Thank you for waiting. Your reservation is found. 
 customer: Please cancel the reservation. 
 agent: Your reservation is cancelled. 
 customer: Thank you for the service. 
 agent: Thank you for reaching us.
Output:
cancel