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. 
 agent: Hello, how may I help you today? 
 customer: I want to cancel my recent reservation owing to an emergency. 
 agent: Sure, may I know your good name? 
 customer: My name is Richard Campbell. 
 agent: I have checked in reservation list to cancel your ticket, but could not find any reservation with your name. 
 customer: Thank you. 
 agent: Thank you for opting us.
no_reservation