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, my name is Jennifer Lewis. 
 agent: Hello, how can I help you today? 
 customer: I want to attend my brother-in-law's marriage at Detroit, can you book a ticket with price under 200? 
 agent: Sure, please mention your airport codes? 
 customer: Sure, I would like to travel from PHX to DTW. 
 agent: May I know your travel dates? 
 customer: Yes, my travel dates are 04/04 and 04/06. 
 agent: We found a flight with your requirement, price is 200 with single connection limit. 
 customer: Ok, proceed with my booking. 
 agent: Your ticket is confirmed with southwest airlines, flight number is 1013. 
 customer: Thank you. 
 agent: Thanks for reaching us, have a good day.
Solution:
book