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: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you help me to book a flight from PHL to DTW? 
 agent: Sure, let me know your travel dates? 
 customer: I would like to travel on Sept 26 and 28. 
 agent: Do you have any requirements? 
 customer: I need a connecting flight. 
 agent: Ok, may I know your name please? 
 customer: My name is Sandra Hall. 
 agent: United Airlines has a connecting flight with number 1005 for fare 100, shall I proceed? 
 customer: Proceed with booking. 
 agent: Your ticket is reserve in economy class. 
 customer: Thank you. 
 agent: Thank you for opting us.
Output:
book