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 can I help you? 
 customer: I am Laura Turner. Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me? 
 agent: Sure, please wait a minute. 
 customer: Ok. 
 agent: Sorry, there is no reservation found with your name. 
 customer: No issue. Thank you. 
 agent: Thank you for reaching us.
Student:
no_reservation