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. My name is Karen Hall. 
 agent: Hello, what can I do for you? 
 customer: I want to visit my girlfriend  this month, could you help me in booking the ticket? 
 agent: Sure, can you provide your airport codes please? 
 customer: It's from LGA to EWR. The dates of travel are from 12/05 to 12/07. 
 agent: I found a flight with your requirements in Hawaiian airlines. 
 customer: Please book the ticket. 
 agent: Your ticket is booked with 1024 flight number. 
 customer: Thank you for your help. 
 agent: Have a nice journey. Welcome.
book