You will be given a definition of a task first, then some input of the task.
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

customer: Hi. 
 agent: Hello, how may I help you? 
 customer: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation? 
 agent: Sure, may I know your name please? 
 customer: Jeffery Rodriguez. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: Sorry, there is no active reservation found with your name in our records. 
 customer: No issue. Thank you. 
 agent: Most welcome.
Output:
no_reservation