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
Input: customer: Hello. 
 agent: Hello. 
 customer: Sandra Phillips here. 
 agent: How may I guide you today? 
 customer: I want to book a flight on the route from HOU to LAS, can you help me? 
 agent: Sure, I am glad to help you with that. Can you please provide your planned dates of travelling? 
 customer: My travelling dates will be from 05/22 to 05/24. 
 agent: Please wait a moment to check the flights on your route. 
 customer: Ok, take your time. 
 agent: Based on your travel details, I have found a flight with a single connection with a fare of 100 from Spirit airlines. If you are ok with this, please inform me to book the flight. 
 customer: You can proceed with booking my ticket. 
 agent: Ok, your ticket has been confirmed in flight number 1026. 
 customer: Thank you for helping me with booking. 
 agent: Thank you for reaching us, have a great journey. 
 customer: Most welcome.
Output:
book