Given the task definition and input, reply with output. 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

customer: Hello. 
 agent: Hello. 
 customer: Jessica Hernandez here. 
 agent: How can I aid you? 
 customer: Do you have any flight from LAS to attend a business meeting in SFO? 
 agent: Sure, may I know your journey dates please? 
 customer: My journey dates are 05/25 and 05/27. 
 agent: Wait a moment please. 
 customer: Sure, take your own time. 
 agent: Spirit airlines is available in your route with the ticket fare of 100, shall I proceed with the booking? 
 customer: You can proceed. 
 agent: Your ticket is booked with the flight-1002. 
 customer: Thanks for your help and valuable information. 
 agent: Thank you for reaching us.
book