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: Hi,. 
 agent: Hello. How can I assist you? 
 customer: I am Shirley Brown. 
 agent: Ok. 
 customer: Please book a flight to Austin, TX-AUS from Philadelphia, PA-PHL, for flower festival. 
 agent: Ok, may I know your travelling dates? 
 customer: Depart date is 07/03 and return by 07/05. 
 agent: May I know your price limit? 
 customer: Price limit is 200. 
 agent: There is a Delta 1005 airline which matches your requirememnts. Shall I proceed with that airline? 
 customer: I need a connecting flight. 
 agent: There is a connection in between the journey. 
 customer: Please book flight. 
 agent: Your booking has been confirmed on name of Shirley Brown. 
 customer: Thanks. 
 agent: Thank you for approaching us.
Output:
book