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
Q: customer: Hello. 
 agent: Hello. How may I guide you? 
 customer: I am Sarah Edwards. I am planning to cancel my recent reservation. Can you please cancel my ticket? 
 agent: Sure, I can help you to cancel your ticket. 
 customer: Sure. 
 agent: Please wait a minute, I will check your ticket and then I will proceed with the ticket cancellation. 
 customer: Sure, take your own time. 
 agent: Ok Sarah Edwards, I have found your ticket in the confirmation list. 
 customer: Please cancel it. 
 agent: I have successfully cancelled your ticket. 
 customer: Thank you for your service. 
 agent: You are welcome.
A:
cancel