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
Q: customer: Hello. My name is Linda Lewis. 
 agent: Hello. How can I help you Linda? 
 customer: I have a plan to attend my friend's anniversary in Phoenix, can you help me for booking a flight ticket? 
 agent: Sure, I am mirthful to help you in booking. Can you please share your travel dates? 
 customer: My travelling dates are from 07/25 till 07/27. 
 agent: Kindly mention your airport codes? 
 customer: My travelling airport codes are from EWR to PHX. 
 agent: Flight 1003 in Hawaiian airlines is available for you with 1 connection and fare is 300. Shall I proceed? 
 customer: Ok, please proceed for booking. 
 agent: Ok Linda, your booking is confirmed. 
 customer: Thank you for booking. 
 agent: Welcome, have a safe journey. Thank you for opting us.
A:
book