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, Lisa Johnson here. 
 agent: Hello,. How may I assist you? 
 customer: I am going for a Grand Canyon Adventure at San Francisco, CA - SFO. Can you avail me flight ticket with single connection? 
 agent: Sure. Please let me know your journey dates in order to book a ticket. 
 customer: I want to travel on 11/26 and recur on 11/28. 
 agent: May I know your boarding airport code? 
 customer: I want to board from Seattle, WA - SEA. 
 agent: Ok. Flight ticket is available with price 200, airline is Delta. Flight number is 1027 with connections 1. 
 customer: Please proceed. 
 agent: Ticket is booked. 
 customer: Thanks for your assistance. 
 agent: Thanks.
Output:
book