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. How may I serve you at this moment? 
 customer: Can you please help me in reserving the ticket from OAk to DEN? 
 agent: Sure, may I know your good name please? 
 customer: Myself Ronald Rodriguez. 
 agent: Ok, do you need a lay by in between the journey? 
 customer: I an comfort to travel in single connection flight. 
 agent: On which dates would you like to travel? 
 customer: I am planning my trip on July 13 and again I will return back on July 15. 
 agent: Do you have any other preferences? 
 customer: My airline preference is normal-cost. 
 agent: Do you have any other preferences? 
 customer: No. 
 agent: We found a Hawaiian Airlines with fare of 100 and a lay by in between the journey matches your schedule. 
 customer: Yes, please go ahead and reserve the ticket. 
 agent: Your ticket has been confirmed with flight number 1025. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.
book