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 Michael Green. 
 agent: Hello, how may I serve you today? 
 customer: I am planning to conduct a film festival at Seattle. Can you help me in my booking? 
 agent: Sure, we are blissful to help you. 
 customer: Thank you. 
 agent: Can you please mention your preferred journey dates? 
 customer: I will start my journey on 01/08 and again I will return on 01/10. 
 agent: May I know your source point? 
 customer: My source airport code is Las Vegas, NV - LAS. 
 agent: Please provide the airport code of Seattle. 
 customer: My destination is Seattle, WA - SEA. 
 agent: Please let me know if you need a connecting flight in between your journey. 
 customer: Yes, I need a flight with a layover. 
 agent: Please wait, I will check the availability of flights and get back to you. 
 customer: Sure. 
 agent: Frontier airline with flight number 1029 is available on your route. Flight is with single connection and fare is 200. 
 customer: Proceed with my booking. 
 agent: Ok. Your booking has been confirmed. 
 customer: Thank you for your help. 
 agent: Thank you for opting us.
A:
book