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. How may I aid you? 
 customer: I am Patrick Edwards here, I want to book a flight ticket from PHX to ATL. Can you find a flight ticket for me? 
 agent: Sure, please provide your itinerary dates. 
 customer: Sure, I am planning to travel on these days that is on 02/05 and return on 02/07. 
 agent: Please give me a moment to check for available flights. 
 customer: Sure. 
 agent: Southwest airlines with flight 1008 is providing service with a connecting flight and ticket costs you only 100. 
 customer: Yes, you can proceed with the ticket confirmation please. 
 agent: Your ticket is confirmed. 
 customer: Thank you for your valuable help. 
 agent: Thank you for reaching us.
A:
book