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

Let me give you an 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.
The answer to this example can be: no_reservation
Here is why: 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

OK. solve this:
customer: Hello, I am Anna Evans. 
 agent: Hello,. How may I help you? 
 customer: Me and my friend are planning to attend for Innovation Festival to learn new things, can you help me for booking a plane under the price limit of 500? 
 agent: In order to book ticket, please provide your journey schedule? 
 customer: My journey dates are from 02/19 to 02/21. 
 agent: Please provide your journey codes? 
 customer: Sure, I am heading from GA - ATL to MI - DTW. 
 agent: Ticket can be booked with airline UA, price 100. Flight number 1010, connections 1. Shall I proceed booking ticket? 
 customer: Ok, you can proceed for booking. 
 agent: Ticket is booked. 
 customer: Thanks for your assistance. 
 agent: Thanks.
Answer:
book