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 can I assist you today? 
 customer: I am Elizabeth Miller. Can you help me in booking the ticket from PHL to IAD? 
 agent: Sure, can you please share your travel dates? 
 customer: My planning dates are from 09/22 to 09/24. 
 agent: Let me check for the availability of flight. 
 customer: Ok. 
 agent: Elizabeth, there is a flight available with price 100 and the connection is 1 with AA airline. Would you like me to proceed with the booking? 
 customer: That's great, please proceed. 
 agent: Your booking is confirmed with 1004 flight number. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.
Output:
book