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 help you? 
 customer: Myself John Martin. I just want to visit holy places at OAK from PHX, can you please book me a ticket? 
 agent: Sure, can you please specify me your dates of travel? 
 customer: Sure, my travel dates are Oct 2nd and Oct 4th. 
 agent: Do you have any requirements? 
 customer: My connection limit should be 1 and I can afford 5000 or less. 
 agent: There is a connecting flight 1010 of Frontier airlines, can I proceed? 
 customer: Sure, please proceed with that. 
 agent: Your booking is done, have a safe journey. 
 customer: Thank you for your kind service. 
 agent: Welcome.
A:
book