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 assist you? 
 customer: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that? 
 agent: Sure, may I know your name to check your reservation from our data base? 
 customer: My name is Larry Jackson. 
 agent: We regret to inform you that there is no active reservation found on your name to change. 
 customer: Anyway, thanks for the information. 
 agent: Thank you for opting us.
Student:
no_reservation