Given the task definition and input, reply with output. 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

customer: Hello. 
 agent: Hello, how may I serve you today? 
 customer: I am planning to book a ticket from LGA to LAS. Can you please help me out? 
 agent: Ok, may I know your planned dates for this journey? 
 customer: I would like to travel on Feb 02 and return back on Fe 04. 
 agent: Do you need a direct flight? 
 customer: I am ok with that. 
 agent: May I know your other requirements? 
 customer: I am ok with any requirements. 
 agent: May I know your name please? 
 customer: Sure, I am Daniel Martin. 
 agent: There is a flight-1001 by American airlines with 1 connection at the price of 100 in economy class with depart at 21:00 hours and return at 16:00 hours. Can I book it for you now? 
 customer: That's fine, please proceed the booking. 
 agent: Daniel Martin, your ticket is booked. 
 customer: Thank you for your service. 
 agent: Thank you for approaching our agency.
book