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 may I assist you? 
 customer: Owing to emergency I want to cancel my recent reservation, can you help me with that? 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: On whose name, I have to check the reservation status? 
 customer: I am Brian Lopez. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Thanks for your time, we found a reservation in your name. Shall I proceed to cancel it? 
 customer: Please proceed. 
 agent: Your reservation has been cancelled successfully. 
 customer: Thank you for your help. 
 agent: Thank you for utilising our services.
Output:
cancel