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 Sharon Martinez. 
 agent: Hello, how may I best serve you for the day? 
 customer: I want to book a flight ticket to Oakland, CA - OAK to meet old friend. Please help me in booking a flight ticket. 
 agent: Sure, when are you planning to travel? 
 customer: My trip dates are from 09/01 to 09/03. 
 agent: Which airport do you prefer to start from? 
 customer: My source airport code is NY - JFK. 
 agent: Thank you for your details, we hardly tried to find a flight with the given details, but there are no flights found with the given information. 
 customer: No problem, thanks for your information. 
 agent: Thank you, hope we serve you next time.
Student:
no_flight