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. 
 agent: Hello. 
 customer: George Phillips here. 
 agent: How may I assist you? 
 customer: I am looking for a normal cost flight for my journey, can you please search is there any flight available between IAD and DEN? 
 agent: Sure, Can I have your planned travel dates please? 
 customer: Thank you, my departure is on May 07 and please book my return ticket also on May 09. 
 agent: Do you have any specifications? 
 customer: I need a connecting flight. 
 agent: I found an economy class ticket in AA airlines with price 200 and it has 1 connection. Can I book your ticket? 
 customer: I am ok with this flight, you can proceed with booking now. 
 agent: Ok, your booking is confirmed with flight number 1014. 
 customer: Thank you for your assistance. 
 agent: Thank you for choosing us.
Solution:
book