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 guide you today? 
 customer: I want to change my reservation, can you help me with that? 
 agent: Sure, can you please mention your name? 
 customer: Edwards Garcia here. 
 agent: Sorry, no reservation found with your given name. 
 customer: No problem, thank you for the information. 
 agent: Thank you for choosing us.
Student:
no_reservation