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: Hello. 
 agent: Hello. How may I aid you? 
 customer: Can you please help me in booking a flight ticket from DCA to LAS? 
 agent: Sure. May I know your name please? 
 customer: Myself Donna Scott. 
 agent: Tell me your travel dates please? 
 customer: I would like to fly on Aug 07 and return on Aug 09. 
 agent: Are you looking for a stopover in your journey? 
 customer: Yes, I need a single connection. 
 agent: Any other preferences? 
 customer: No. 
 agent: Thanks for your patience. I have found united airlines which is a stopover flight. 
 customer: You can proceed to booking. 
 agent: Yes, I have confirmed your flight ticket in flight number 1014. 
 customer: Thank you. 
 agent: Thank you.
A:
book