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. 
 agent: Hello. How can I help you? 
 customer: Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that? 
 agent: Sure, let me know your name to check your reservation details. 
 customer: Ok, I have reserved it on the name of Carol Jackson. 
 agent: Thank you. Please be online for a while. I will check your reservation status and get back to you. 
 customer: Sure, take your time. 
 agent: I'm happy to inform you that I have found a active reservation on your name and I have cancelled it. 
 customer: Thank you for your kind help. 
 agent: Thank you for reaching us.
Student:
no_reservation