Given the task definition and input, reply with output. 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 Michelle Wright. 
 agent: Hello,. How may I serve you? 
 customer: I would like to cancel my reservation as my plan to on a tour with my friends got cancelled. 
 agent: Sure, please wait for a minute, I will revert you. 
 customer: Ok. 
 agent: We found a reservation with your name , can I proceed with cancellation? 
 customer: Yes please. 
 agent: We are done with cancellation, thank you. 
 customer: Thank you for your service. 
 agent: Have a good day.

cancel