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

Ex Input:
customer: Hi. This is Stephen Jones. 
 agent: Hello. How can I assist you? 
 customer: I am planning to travel to PHX to meet my friend,can you please help me to book a flight ticket from SFO? 
 agent: Can you please mention your travelling dates? 
 customer: I want to depart on May 14th and return on May 16th. 
 agent: Let me know your depart and arrival timings? 
 customer: I would like to Return in the morning. 
 agent: Do you want connecting flight? 
 customer: Yes, I want a single connecting flight. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: Sorry, no flights found on your route. 
 customer: It's ok,  thank you for your information. 
 agent: Thank you for connecting with us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how may I be at your service today? 
 customer: I would like to travel from MCO to DEN as a business trip, can you do the reservation? 
 agent: Sure, I will help you in booking the ticket. May I know your travelling dates please? 
 customer: My trip dates are 02/21 and 02/23. 
 agent: Do you have any other specifications? 
 customer: I need break in my journey. 
 agent: Please help me with your name for booking. 
 customer: Charles Wilson here. 
 agent: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1017. Shall I proceed with this flight? 
 customer: Go ahead. 
 agent: Your booking is done. 
 customer: Thank you so much. 
 agent: Most welcome.

Ex Output:
book


Ex Input:
customer: Hello. 
 agent: Hello. 
 customer: I am Brian White. 
 agent: How may I help you ? 
 customer: I am looking for a flight from ATL to LAS, can you help me out? 
 agent: May I know your trip dates? 
 customer: My trip dates are from 02/07 till 02/09. 
 agent: There is a flight for you with 1 connection. Shall I proceed? 
 customer: Please proceed with it. 
 agent: Your ticket is booked. 
 customer: Thank you for your help. 
 agent: Most welcome.

Ex Output:
book