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. 
 customer: Kimberly Martin here. 
 agent: How can I assist you at this moment? 
 customer: I have to cancel my reservation which I have done earlier to participate in dance programme but unfortunately I have stay back here to take care of my grandmother. Can you please help me out with cancelling of my reservation? 
 agent: Sure Martin, I will help you with that. 
 customer: Thanks. 
 agent: Please wait a moment to check your reservation status. 
 customer: Ok, I will wait. 
 agent: Sorry Kimberly Martin, no reservation has found under your name to cancel. 
 customer: Anyway, thanks for the information. 
 agent: Thank you for choosing us, have a great day.
Output:
no_reservation