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, I am Brandon Lee. 
 agent: Hello, how may I serve you today? 
 customer: I am planning to conduct an woman empowerment event at Chicago, can you help me in booking a ticket with single connection? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Can I know your source and destination airport codes? 
 customer: My source and destination airport codes are Minneapolis, MN-MSP and Chicago, IL-ORD. 
 agent: On which dates are you going to travel? 
 customer: My travel dates are from 07/29 to 07/31. 
 agent: Ok, wait a minute. 
 customer: Ok. 
 agent: We found a flight on UA airline, flight number as 1027 with the fare of 100. 
 customer: Please proceed for booking. 
 agent: Your ticket has been booked. 
 customer: Thank you for your service. 
 agent: Thank you for reaching us.
Output:
book