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 can I assist you? 
 customer: I want to cancel my reservation as my project got ramp down. Can you help me with that? 
 agent: Sure, may I know your name? 
 customer: I am Mary Martin. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Thank you for your valuable time, we found reservation on your name and cancelled successfully, amount will refund to your registered bank account within 3 working days. 
 customer: Thank you. 
 agent: Thank you for opting us.
Output:
cancel