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

Input: Consider Input: customer: Hello. 
 agent: Hello\. How may I help you? 
 customer: Mark Phillips here. Can you please help me in booking the ticket from LGA to AUS? 
 agent: May I know your trip dates? 
 customer: My trip dates are 03/21 and 03/23. 
 agent: There is a direct flight with flight number 1018, can I proceed? 
 customer: Please search for a flight with 1 halt. 
 agent: I am sorry to inform you that there is no flight available with 1 connection. 
 customer: That's ok, thank you for giving the information. 
 agent: Thank you for contacting us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Rebecca Nelson. 
 agent: Nelson, how may I assist you? 
 customer: I am looking for a direct flight, could you please help me with that? 
 agent: Sure, may I know your itinerary dates? 
 customer: I would like to take off on 11/29 and return on 12/01. 
 agent: Please share your origin and destination airport codes. 
 customer: My nearest source airport code is JFK and destination airport code is PHX. 
 agent: Please give me a moment to check for a best flight. 
 customer: Sure, take your time. 
 agent: Frontier airlines with flight 1004 having 1 connection is providing service on your route. 
 customer: I am looking for a direct flight. 
 agent: Let me check. Sorry, no direct flight is available. 
 customer: That's ok, not an issue. 
 agent: Thank you for contacting us. 
 customer: Anyways, thank you for the information.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, How can I help you? 
 customer: I want to change my reservation, due to heavy rainfall in Seattle, can you help me in changing the reservation? 
 agent: Sure, May I know your name? 
 customer: I am Thomas Taylor. 
 agent: Sorry, No reservation found on your name. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for opting us.
Output: no_reservation