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, I am Samuel Moore. 
 agent: Hello, how may I assist you today? 
 customer: I need to book a flight ticket from LGA to BOS, can you please help me to book a flight ticket? 
 agent: Sure, can you please share your departure and arrival dates? 
 customer: Sure, my journey dates are May 17 to May 19. 
 agent: Do you have any specifications to be met? 
 customer: I need a halt. My price is 5000. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Thank you for your valuable time, unfortunately no flights found on that route. 
 customer: Ok, not an issue. Thank you for your information. 
 agent: Thank you for approaching us.
Student:
no_flight