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: Hello. 
 agent: Hello, how can I be your helping hand today? 
 customer: Me and my friends planned a trip, but due to heavy rains in my destination place our trip got postponed. Can you help me to change it? 
 agent: Sure, I am here to aid you. 
 customer: Ok. 
 agent: May I know your name? 
 customer: Sure, my name is Kenneth Thompson. 
 agent: Ok, please wait for a few minutes. 
 customer: Sure. 
 agent: Thank you for your time, we are sorry to inform you that we did not find any reservation on your name. 
 customer: Not an issue, thanks for your help. 
 agent: Thank you for approaching us.
Output:
no_reservation