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: My exams got postponed, can you please change my existing reservation? 
 agent: Sure, I will help you with that. 
 customer: Thank you. 
 agent: May I know your good name? 
 customer: I am Angela Carter. 
 agent: Please wait for a moment. 
 customer: Ok. 
 agent: Thank you for waiting, there is no reservation found on your name. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for availing us.
no_reservation