Instructions: 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 guide you? 
 customer: I would like to cancel my recent reservation, will you help me with that? 
 agent: Sure, I am here to help you for this. May I know your name please? 
 customer: Myself Jack Wilson. 
 agent: Please wait for a while. 
 customer: Ok, I will wait. 
 agent: I found your reservation. Can I proceed for cancel? 
 customer: Sure, you can cancel it. 
 agent: Your reservation is cancelled successfully. 
 customer: Thank you for helping me. 
 agent: Thank you very much for approaching our agency.
Output:
cancel