Instructions: 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 help you today? 
 customer: Can you please help me to book a flight ticket from ORD to SEA? 
 agent: Sure, please share your planned travel dates? 
 customer: My trip dates are Apr 10 to Apr 12. 
 agent: Any other requirements to be met? 
 customer: No. 
 agent: Can I have your name please? 
 customer: My name is Shirley Hall. 
 agent: Frontier Airline flight 1003 available with connection limit 0 and fare is 200, shall I confirm this economy class flight? 
 customer: Ok, please proceed. 
 agent: Ok, your ticket has been booked. 
 customer: Thank you. 
 agent: Thank you for reaching us.
Output:
book