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: Hi, I am Michelle Lewis. 
 agent: Hello, how can I aid you? 
 customer: Owing an emergence, I want to cancel my reservation. Can you please help me with it? 
 agent: Sure, I am here to help you. Please wait. 
 customer: Ok. 
 agent: Thank you for waiting, we found a reservation on your name and it has been cancelled as per your request. 
 customer: Thank you. 
 agent: Thank you for reaching us, have a nice day.
cancel