Definition: 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
Input: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: My name is Jacob Thomas, I want to book a flight from DTW to OAK to visit trade fair. Can you book a flight for me? 
 agent: Sure, may I know your travelling dates? 
 customer: I will fly on Nov 12 and return on Nov 14. 
 agent: Do you have any depart and return time? 
 customer: I will depart in afternoon. 
 agent: Can I know your class? 
 customer: Sorry there is no any class preference. 
 agent: There is a flight on United airline, flight number 1001 with the fare of 200 and depart is 17 PM. Can I proceed? 
 customer: Please proceed if it have a single connection. 
 agent: Your ticket has been booked. 
 customer: Thank you for helping me. 
 agent: Thank you for reaching us.
Output:
book