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. Brenda Williams here. 
 agent: Hello, How can I respond to your request? 
 customer: I want to meet my grand parents who are staying in ORD. Can you please help me to book a flight from SFO? 
 agent: Sure, we are ecstatic to help you. 
 customer: Thank you. 
 agent: When are you planning to make your journey? 
 customer: I want to start my journey on June 13 and need to end it on June 15. 
 agent: Ok, which type of class do you prefer for your journey? 
 customer: I am comfortable with any class. 
 agent: May I know if you want any specific time for your departure and return? 
 customer: Sure, my depart time should be on afternoon. 
 agent: Do you prefer any lay by in between journey? 
 customer: Yes, I need a lay by in between journey. 
 agent: Thank you for your details, we have found a JetBlue airline, flight number-1013, connections-0 and ticket-100. Would you like me to proceed next? 
 customer: Ok, please proceed. 
 agent: Your ticket has been reserved under your name on respective dates of your travel. 
 customer: Thank you. 
 agent: Thank you for your presence. We hope to serve you again.
book