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 may I assist you today? 
 customer: I would like to cancel my reservation which is under my name. Can you please help me with that? 
 agent: Sure, may I know your name please? 
 customer: My name is William Mitchell. 
 agent: Please wait for a moment. 
 customer: Sure, take your time. 
 agent: Sorry to inform you that, there is no reservation found as per your name in our database. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for reaching us with a query. 
 customer: You are welcome.
Student:
no_reservation