You will be given a definition of a task first, then some input of the task.
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 can I assist you now? 
 customer: Lisa Roberts here. I want to travel from PHL to MSP for attending a seminar. Can you please help me for booking the flight ticket? 
 agent: Sure, I will help you with that. Can I have your travel dates please? 
 customer: My travelling dates are from 06/19 to 06/21. 
 agent: Ok, please wait a moment to check flight availability. I have found a flight with connection 1 and price 100 in AA airlines. Shall I proceed with booking? 
 customer: Please proceed for booking the flight ticket. 
 agent: Ok Lisa Roberts, your booking has done with flight number 1013. 
 customer: Thanks for helping me. 
 agent: Thank you for choosing us, have a great journey.
Output:
book