Detailed 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
Problem:customer: Hello, I am Anna Evans. 
 agent: Hello,. How may I help you? 
 customer: Me and my friend are planning to attend for Innovation Festival to learn new things, can you help me for booking a plane under the price limit of 500? 
 agent: In order to book ticket, please provide your journey schedule? 
 customer: My journey dates are from 02/19 to 02/21. 
 agent: Please provide your journey codes? 
 customer: Sure, I am heading from GA - ATL to MI - DTW. 
 agent: Ticket can be booked with airline UA, price 100. Flight number 1010, connections 1. Shall I proceed booking ticket? 
 customer: Ok, you can proceed for booking. 
 agent: Ticket is booked. 
 customer: Thanks for your assistance. 
 agent: Thanks.
Solution:
book