Given the task definition and input, reply with output. 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: Hi. 
 agent: Hello. How can I assist you at this moment? 
 customer:  Would it be possible to cancel my reservation, which I have done with my name? 
 agent: Sure, can I have your good name please to check your reservation status? 
 customer: My name is Karen Jackson. 
 agent: Ok, please wait a moment. 
 customer: Ok. 
 agent: Sorry Karen Jackson, no reservation has found under your name to cancel. 
 customer: It's ok, thank you for the information. 
 agent: Thank you for choosing us.
no_reservation