Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. I want to cancel my recent reservation due to postpone of my exams. 
 agent: Hello, how may I serve you now? 
 customer: Can you help me with that? 
 agent: Sure, I will help you with cancellation. 
 customer: Thank you. 
 agent: May I know the name on which the reservation is made? 
 customer: I am Catherine Parker. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: Thank you for waiting, sorry there is no reservation found on your name in our system data. 
 customer: That's ok. Thank you for your service. 
 agent: Thank you for reaching us.
Student:
no_reservation