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, I am Gary Martin. 
 agent: Hello, how can I help you today? 
 customer: I need to cancel my recent reservation, as I am suddenly fallen sick. Can you please help me with it? 
 agent: Sure, I am here to help you. Please wait for some time. 
 customer: OK. 
 agent: Thanks for waiting. We found reservation on your name and it has been successfully cancelled. 
 customer: Ok, thank you for your help. 
 agent: Thank you for reaching us.
Output:
cancel