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? If you are still confused, see the following example:
customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Solution: no_reservation
Reason: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

Now, solve this instance: customer: Hi. 
 agent: Hello. How may I assist you today? 
 customer: Can you please book me a flight ticket from LAS to PHL? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Please help me with your name. 
 customer: I am Sarah Garcia. 
 agent: Please let me know with your planned travel dates. 
 customer: I want to start my journey on Sept 11th and return on Sept 13th. 
 agent: Do you need a direct or connecting flight? 
 customer: I am comfortable with both. 
 agent: Please let me know with your preferences in your journey. 
 customer: I want an economy class to travel. 
 agent: Do you have any other preferences in your journey? 
 customer: No. 
 agent: Please allow me a minute. 
 customer: Ok. 
 agent: We have a  connecting flight with two breaks operated by American Airlines with a fare of 100. Is it ok for you? 
 customer: Yes, please proceed. 
 agent: I have booked your ticket in economy class flight-1026. It departs at 0 AM and arrives at 12 PM. 
 customer: Thank you. 
 agent: Thank you for reaching us. Have a great time.
Student:
book