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: Hi. 
 agent: Hello, how may I be of your assistance? 
 customer: I want to cancel my reservation as my workshop got cancelled. Can you please cancel my reservation made on name John Evans? 
 agent: Sure, just a moment I will check and let you know. 
 customer: Ok. 
 agent: Unfortunately there is no reservation found with your name. 
 customer: Ok, no worries. Thanks for your information. 
 agent: Thanks for contacting us, have a nice day.
Student:
no_reservation