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. 
 agent: Hello, how may I help you? 
 customer: This is Kimberly Nelson, I need your help in cancelling my recent reservation. 
 agent: Sorry Nelson, unfortunately there is no reservation found under your name. 
 customer: It's OK. Thank you for your response. 
 agent: Thank you, have a good day.
Output:
no_reservation