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
Q: customer: HI. 
 agent: Hello. How may I be of your address? 
 customer: I want to book a flight ticket to Las Vegas with price under 1000. Can you please help me with it? 
 agent: Sure, can I know your connection limit? 
 customer: I need a single connection. 
 agent: Please let me know your boarding and landing points. 
 customer: Airport codes are HOU-LAS. 
 agent: Kindly share your planned travelling dates to proceed further. 
 customer: Travel dates are 04/03 and 04/05. 
 agent: Please wait a while. 
 customer: Ok. 
 agent: We found a Frontier airline matching your essential details with one connection and the flight number-1006. 
 customer: Please proceed booking with the name Stephen Evans. 
 agent: Your booking has been processed successfully. 
 customer: Thanks for the help. 
 agent: You're welcome. Happy journey.
A:
book