Instructions: 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
Input: customer: Hello. 
 agent: Hello, how best can I aid you today? 
 customer: Can you please change my reservation, due to change of my trip plan to another location? 
 agent: Sure, please share your good name? 
 customer: My name is Robert Gonzalez. 
 agent: Please stand by. 
 customer: Sure. 
 agent: Thank you for waiting, there is no active reservation found with the given name. 
 customer: Ok, no issue. Thank you. 
 agent: Thank you for contacting us.
Output:
no_reservation