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 assist you today? 
 customer: I need to cancel my reservation due to my planned event got cancelled. So please help me with that. 
 agent: Sure, we are here to help you with cancellation. 
 customer: Thank you. 
 agent: To check your previous reservation, may I know your name? 
 customer: Sure, myself Emily White. 
 agent: Thanks for providing your name, please standby. 
 customer: It's ok, I will wait for your response. 
 agent: Thanks for your time, we found a reservation on your name and it is successfully cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for approaching our service.
Output:
cancel