Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello, my name is Patricia Green. 
 agent: Hello, how can I assist you at this moment? 
 customer: Owing to emergency, I need to cancel my recent reservation. Please help me with that. 
 agent: Sure, I am here to help you. Please allow me a moment to check your reservation status. 
 customer: Sure. 
 agent: Patricia Green, there is no active reservation found under your name in our database to cancel it. 
 customer: No problem, thanks for your information. 
 agent: Thank you for utilising our service.
Student:
no_reservation