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

Example Input: customer: Hi, I am Timothy Campbell. 
 agent: Hello, what can I do for you today? 
 customer: I am planning to travel to New York to celebrate my cousin birthday. Can you make a reservation with a single connection? 
 agent: Sure, could you please share your travelling dates? 
 customer: Sure, I need to fly on 06/09 and 06/11. 
 agent: Ok, may I know your near by airport codes? 
 customer: Sure, I need to deviate from Austin AUS. 
 agent: Kindly mention your destination airport code? 
 customer: Sure, my landing point is LGA. 
 agent: There are no flights found on your requested dates. 
 customer: Ok, not an issue. 
 agent: Thank you for reaching us. 
 customer: Thank you for your information.
Example Output: no_flight

Example Input: customer: Hi, Patrick Smith here. 
 agent: Hello. How can I help you? 
 customer: We friends were planning to go for Nutshell Bike Tour to Austin, TX-AUS on 08/16. Can you hold me a ticket with single connecting flight? 
 agent: Sure, may I know source code and return journey date please? 
 customer: Sure, I will be back on 08/18 at Orlando, FL-MCO. 
 agent: There is a flight with single connection, can I proceed for booking in 1004 flight? 
 customer: Ok, please proceed. 
 agent: Your booking is done in UA airlines, have a safe journey. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Example Output: book

Example Input: customer: Hi. 
 agent: Hello. How can I help you now? 
 customer: I am Carol Baker. 
 agent: Ok. 
 customer: Can you help me to book a flight from IAD to ATL? 
 agent: Sure, can you please mention the travelling dates of your journey? 
 customer: My trip dates are 04/15 and 04/17. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry Carol, there are no flights found on your requested dates. 
 customer: Oh! ok. 
 agent: Thank you for approaching us, have a nice day. 
 customer: Thank you for your time. 
 agent: You are welcome.
Example Output:
no_flight