Definition: 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
Input: customer: Hi, I am Betty Turner. 
 agent: Hello, how may I serve you? 
 customer: I want to visit Sliver street studios at Houston , can you please help me with booking? 
 agent: Sure, please provide your travelling details for reserving a ticket? 
 customer: My travel dates are from 11/05 to 11/07. My airport codes are from MSP to HOU. 
 agent: Ok, I will check the availability of flights on your preferred dates and revert you in a moment. 
 customer: Ok. 
 agent: Here is an airline UA of flight number 1006 to Houston. price 100 with a single connection. 
 customer: You can proceed with booking. 
 agent: Ok, your ticket has been confirmed. 
 customer: Thank you for your great service. 
 agent: Thank you for contacting us, have a wonderful day.
Output:
book