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 assist you? 
 customer: Please help me to cancel my recent reservation as my plan to meet my grand parents got postpone due to technical issues. 
 agent: Sure. Can I have your name? 
 customer: I am Jessica Mitchell. 
 agent: Please, wait a minute. 
 customer: Sure. 
 agent: Thank you for waiting, we found a reservation on your name. Shall I cancel it? 
 customer: Ok, please cancel the ticket. 
 agent: Your ticket has been cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for opting us.
cancel