Definition: 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 can I help you today? 
 customer: Please book a ticket from ORD to PHL to attend my sister wedding. 
 agent: Sure, please share your planned travel dates? 
 customer: My travelling dates are Mar 23 and Mar 25. 
 agent: Do you have any connection limit? 
 customer: I am comfortable with any connection. 
 agent: Can I have your name please? 
 customer: Sure, I am Laura Hernandez. 
 agent: Any other preferences? 
 customer: No. 
 agent: Southwest airline flight 1011 available with connection limit 1 and fare is 100, shall I confirm this economy class flight? 
 customer: Ok, please proceed. 
 agent: Ok, your ticket has been processed. 
 customer: Thank you. 
 agent: Thank you for opting us.
Output:
book