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. I am Cynthia Jackson. 
 agent: Hello, what can I serve you today? 
 customer: I want to attend an event in Washington. Can you book a flight ticket from IAD to IAH? 
 agent: Sure, please share your preferred travelling dates? 
 customer: I want to travel on 04/01 and 04/03. 
 agent: We found a Delta airline with fare of 100 matches your schedule. Shall I proceed with booking? 
 customer: Yes, proceed to booking. 
 agent: Your ticket has been confirmed with flight number 1027. Thank you reaching us. 
 customer: Thank you for your help.
Output:
book