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: Hello. 
 agent: Hello, may I know your good name? 
 customer: My name is David Smith. 
 agent: How can I assist you David? 
 customer: I want to cancel my reservation due to cancel of my conference in Wipro. 
 agent: Sure, please wait for a moment. 
 customer: Ok. 
 agent: Thanks for waiting, we found a reservation with your name. Shall I proceed to cancellation? 
 customer: You can proceed to cancellation. 
 agent: Your reservation has been successfully cancelled. 
 customer: Thanks for your good service. 
 agent: Thanks for opting us. Have a nice day.
cancel