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
Problem:customer: Hello, I am Dennis Williams. 
 agent: Hello Dennis Williams, how may I render you? 
 customer: I am planning to travel from SEA to LAX. Can you please help me to book a ticket? 
 agent: Sure, please provide your itinerary dates. 
 customer: My travelling dates will be on Nov 21 to Nov 23. 
 agent: Please wait for a while. Let me check for a best flight on your route. 
 customer: Ok. 
 agent: UA airlines with flight 1010 is providing service with a connecting flight on your planned dates. 
 customer: You can proceed to booking. 
 agent: Your ticket is confirmed. 
 customer: Thank you. 
 agent: Thank you for reaching us.
Solution:
book