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: Hello,. 
 agent: Hello, How may I assist you today? 
 customer: My friends house warming function was postponed due to under construction. So I want to cancel my recent reservation. 
 agent: Sure, May I know your name please? 
 customer: Sure. I am Virginia Turner. 
 agent: Ok, please wait for a minute, I will check and let you know. 
 customer: sure. 
 agent: Thanks for your patience. Unfortunately, there is no reservation found with your name. 
 customer: Ok, no problem. 
 agent: Thank you for approaching us. 
 customer: Thank you for assisting me.
no_reservation