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: Hi. 
 agent: Hello. 
 customer: Jerry Miller here. 
 agent: How may I assist you? 
 customer: Can you please check for the flights from LAS to HOU for my journey? 
 agent: Sure, can you please share your planned travel dates? 
 customer: My journey dates are from Apr 24th to Apr 26th. 
 agent: Do you have any requirements? 
 customer: I need a stopover between my journey. 
 agent: I found an economy class ticket in Delta airlines with fare 100 and it has 1 connection. Can I book your ticket? 
 customer: You may  proceed with booking. 
 agent: Ok, your booking is confirmed with flight number 1017. 
 customer: Thank you for helping me with booking. 
 agent: Thank you for choosing us.
book