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, how may I assist you today? 
 customer: I would like to meet my business partner at Chicago, please help me in booking a ticket from HOU to ORD. 
 agent: Sure, we are here to help you. 
 customer: Thank you. 
 agent: Can you share me your trip dates? 
 customer: My planned trip dates are on Nov 25 and Nov 27. 
 agent: Do you need any way station in your journey? 
 customer: Yes, I need a connecting flight. 
 agent: Is there any class preference for you? 
 customer: Any class is comfortable for my trip. 
 agent: We found a connecting flight with fare of 100 and 1007 flight number. Shall I proceed? 
 customer: Ok, please book the ticket with the name Lisa Harris. 
 agent: Your seat has been reserved with Jet Blue airline in economy class. 
 customer: Thank you for your assistance. 
 agent: Thank you for availing us.
Output:
book