Q: 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. 
 customer: My name is Jennifer Green. 
 agent: Green, how can I assist you? 
 customer: I would like to cancel my current reservation because my cousin meet an accident. 
 agent: Sorry about your cousin, let me check our database to cancel your ticket. 
 customer: Ok. 
 agent: Sorry, no reservation found by your name. 
 customer: That's alright, not an issue. 
 agent: Thank you for choosing us. 
 customer: Thank you for helping me.
A:
no_reservation