Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello,. 
 agent: Hello, how may I help you? 
 customer: I am Brain Gonzalez want to give a surprise to my mom on her birthday. Can you be  my helping hand in booking a ticket from Denver to Los Angeles. 
 agent: Sure, we are here to help you. Could you please provide me your travelling details? 
 customer: Airport codes are CO- DEN to CA-LAX. 
 agent: May I know your journey dates? 
 customer: I want to leave on june/11 and return on june/13. Please make sure that the price should not be 500 with a single connection. 
 agent: We are happy to inform you that there is a flight found on your information. 
 customer: OK, please provide me flight details? 
 agent: Flight details are Flight number:1008, airline: Hawaiian with price limit 200 and one connection. Shall I proceed for booking? 
 customer: OK, confirm my booking. 
 agent: Your ticket has been confirmed. 
 customer: Thank you for your srvice. 
 agent: Thank you.
Student:
book