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. Samantha Green here. 
 agent: Hello, how can I aid you? 
 customer: I want to change my existing reservation due to some changes in weather conditions. Can you help me in that? 
 agent: Sure, please wait a moment. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on your name. 
 customer: Ok, not an issue. Thank you for your information. 
 agent: Thank you for reaching us.
Student:
no_reservation