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: Hi. 
 agent: Hello. How can I aid you? 
 customer: I am Samuel Miller. I am planning to travel from LAS to DFW, can you help in booking a flight? 
 agent: Sure, We are here to help you. How much can you pay for buying your ticket? 
 customer: My budget is only 200. 
 agent: On what dates you want me to book the ticket? 
 customer: My travelling dates are 10/25 to 10/27. 
 agent: Thank you for your details, please hold a moment let me search a flight for you. 
 customer: Ok. 
 agent: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport. 
 customer: That's ok, thank you. 
 agent: Thank you for contacting us.
Student:
no_flight