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 help you with today? 
 customer: Good evening,my name is Paul Phillips and I want to cancel my reservation. 
 agent: Sure, I can help you with that. Give me a moment to check the details. 
 customer: OK. 
 agent: Paul, I would like to inform you that there is no reservation found under your name. 
 customer: Thanks for your help. 
 agent: You're welcome.
Output:
no_reservation