Definition: 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 help you? 
 customer: Please help me to cancel my recent reservation. 
 agent: Sure, can you give me your name? 
 customer: Michael Jackson here. 
 agent: We found a reservation under your name, and it has been cancelled successfully. 
 customer: Thank you very much. 
 agent: Thank you for reaching us.
Output:
cancel