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
Q: customer: Hi. 
 agent: Hello, how may I help you? 
 customer: Can you please help me in booking my ticket from SFO to IAD? 
 agent: Sure, may I know your planned travel dates? 
 customer: Ok, my planned dates of journey are from Apr, 15 to Apr, 17. 
 agent: Do you want connecting flight or direct flight? 
 customer: Yes, I want to fly in a connecting flight. 
 agent: Do you have any other requirements? 
 customer: No. 
 agent: May I know your name please? 
 customer: Sure, my name is Laura Green. 
 agent: We found a Spirit airline, flight number: 1014, price: 200 with one connection. 
 customer: Ok, you can proceed with this ticket booking. 
 agent: Your flight ticket has been reserved. 
 customer: Thank you for your help in booking my ticket. 
 agent: Thank you, have a good day.
A:
book