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 may I oblige you today? 
 customer: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out with changing my reservation? 
 agent: May I know your good name to check the reservation? 
 customer: My name is George Taylor. 
 agent: Thank you for proving your good name, there is no reservation found on your name. 
 customer: Not a problem, thank you for the information. 
 agent: Thank you for making us to help you today.
Output:
no_reservation