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
Q: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I am Melissa Green, I want to cancel my ticket as my plan is cancelled. Can you cancel my ticket? 
 agent: Sure, please hold on. 
 customer: Sure. 
 agent: Sorry, no reservation found on given name. 
 customer: Thank you for the information. 
 agent: Thank you for reaching us.
A:
no_reservation