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, I am Samuel Hall from Las Vegas. 
 agent: Hello, how may I help you at this moment? 
 customer: I need to attend an conference meeting at Philadelphia, PA-PHL. So can you please help me in booking a ticket within fare of 200? 
 agent: Sure, I will aid you. Please send your travelling dates. 
 customer: My travelling dates are from 06/24 to 06/26. 
 agent: Noted. Can I have your source airport code? 
 customer: My boarding airport code is NV-LAS. 
 agent: There is a connecting flight available with Spirit airline, shall I book it? 
 customer: I don't want Spirit airline, can you please check for any another airline for me? 
 agent: Yes, Hawaiian airline is also providing service on your route. Shall I proceed? 
 customer: That's perfect airline for me, please proceed for booking. 
 agent: Your booking is done with flight number 1007. Happy journey. 
 customer: Thanks for your extendable customer support in booking. 
 agent: You are welcome. Thank you for reaching us, have a nice day.
Output:
book