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 aid you? 
 customer: Elizabeth Turner here, I was planning to visit my home town on this weekend. But my doctor suggested me to take rest. So, can you help me with cancelling my reservation? 
 agent: Sure, I will help you. Please wait a minute. 
 customer: Sure, I will be waiting. 
 agent: Thanks for waiting, There is no reservation on your name. 
 customer: Ok, no issues. Thank you for your information. 
 agent: Thank you for reaching us.
Output:
no_reservation