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. 
 customer: I am Donna Martin. 
 agent: How can I assist you today? 
 customer: Please book me a ticket from SFO to LGA to meet my family. 
 agent: Sure, will you mention your travelling dates please? 
 customer: I have planned to travel on 06/05 and 06/07. 
 agent: Do you have any specifications? 
 customer: I prefer normal-cost flight. 
 agent: Please give me a moment. 
 customer: Ok. 
 agent: Thanks for waiting. The UA airlines provides an economy class flight with price 200 and the connections 1. Shall I confirm your ticket? 
 customer: It's good. Please book this ticket. 
 agent: Your ticket is booked. The flight number is 1003. 
 customer: Thank you. 
 agent: Welcome, have a great day.
Student:
book