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, I am Timothy Martin. 
 agent: Hello, how can I support you? 
 customer: I want to alter my existing reservation, my sports event has been postponed. Can you please help me? 
 agent: Sure, I will amend you. 
 customer: Thank you. 
 agent: Please wait for a couple of minutes. 
 customer: Sure. 
 agent: Thanks for your time. we are sorry to inform you that, there is no reservation found with your name. 
 customer: Ok, not an issue. Thank you. 
 agent: Thank you for using our service.
Output:
no_reservation