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, I am Linda Carter. 
 agent: Hello, how may I assist you? 
 customer: As I am a new joiner, I need to attend two days training session in my branch office at Denver, DEN. Can you help me to book a halting flight? 
 agent: Sure, when would you like to travel? 
 customer: I want to fly on 12/12 and recur on 12/14. 
 agent: Help me with the source code? 
 customer: I want to board from Chicago, IL - ORD. 
 agent: THank you for your details, we found a flight in an airline Spirit of number 1010 with a price of 100. 
 customer: Please confirm the booking. 
 agent: Your flight ticket is booked. 
 customer: Thanks for your assistance. 
 agent: Thank you for reaching us.
A:
book