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: Hello. 
 agent: Hello. How can I help you today? 
 customer: Can you please help me to cancel my reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Please wait a moment I will check the reservation list and I will inform you. 
 customer: Ok. 
 agent: Sorry for the inconveniences by what name do you reserved flight ticket? 
 customer: Reservation was done on Christine Phillips. 
 agent: Sorry Christine Phillips, there is no active reservation on your name. 
 customer: Ok, thank you for informing me. 
 agent: Thank you for choosing us.
A:
no_reservation