Detailed 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
Problem:customer: Hello. 
 agent: Hello. 
 customer: I am Elizabeth Wilson. 
 agent: How may I assist you today? 
 customer: Can you please help me in booking my flight ticket from IAD to PHL? 
 agent: Sure, please provide me your travel dates. 
 customer: Ok, my travelling dates are 09/12 and 09/14. 
 agent: Frontier airline is providing flight for you with price 100. Shall I proceed? 
 customer: Ok, please proceed. 
 agent: Your ticket has been booked with flight-1019. 
 customer: Thank you. 
 agent: My pleasure.
Solution:
book