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: Hi. 
 agent: Hello. How can I assist you today? 
 customer: I am William Baker want to attend a workshop at Detroit, can you book a ticket on 06/20 and 06/22? 
 agent: Sure, will you mention your airport codes please? 
 customer: Sure, I want to fly from DFW to DTW. 
 agent: Please give me a moment. 
 customer: Ok. 
 agent: There is a flight with price 100 and the connections 1 is available. 
 customer: Ok, proceed with my booking. 
 agent: Your ticket is booked. The flight number is 1005. 
 customer: Thank you. 
 agent: Welcome, have a great day.
Solution:
book