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: Hello. 
 agent: Hello. 
 customer: I am Amy Clark. 
 agent: Clark, how can I assist you? 
 customer: Can you help me in finding a best flight from MSP to SFO? 
 agent: Sure, I am here to help you. May I know your travel dates please? 
 customer: Thank you. My travelling dates will be May 09 to May 11. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
 customer: Sure. 
 agent: I found a flight for you with Delta airline and it costs you 200. Shall I proceed? 
 customer: You can proceed. 
 agent: Your ticket has been booked with 1026 flight number. 
 customer: Thank you. 
 agent: Welcome, thank you for choosing us. Have a safe flight.
A:
book