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: Hi. 
 agent: Hello. How can I assist you? 
 customer: I am Edward Nelson. I want to change my existing reservation? Can you help me out? 
 agent: Sure, Edward. Please wait a minute. 
 customer: Sure. 
 agent: Edward, there is no reservation available with your details. 
 customer: Oh! that's fine. 
 agent: Thank you for contacting us. 
 customer: Thank you for your search.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: Emily Clark here. 
 agent: How may I lend a hand to? 
 customer: I need to have a flight ticket from OAK to AUS for an important business meeting, can you please help me out with booking of a flight ticket on those locations? 
 agent: Sure Clark, When you are willing to travel? 
 customer: I would like to start my journey on 12/29. 
 agent: Just a moment. 
 customer: Sure. 
 agent: Can you please share me your return dates? 
 customer: I would like to return on 12/31. 
 agent: Clark sorry to intimate, no flights are available with your requirements. 
 customer: Oh! Sad to hear that. Anyway, I will contact another agency to go there. Thank you for the information. 
 agent: You are welcome, thank you very much for contacting us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: Can you aid me to book a flight ticket from ATL to CLT? 
 agent: Yes, can you tell me your dates of travel? 
 customer: My trip dates are Nov 17 and Nov 19. 
 agent: Do you have any other preferences? 
 customer: I prefer for connecting flight and return time should be in the morning. 
 agent: Can I know your name for documentation? 
 customer: Nicholas Roberts here. 
 agent: Sorry to inform you that there are no flights found on your requested dates. 
 customer: Thank you. 
 agent: Thank you for contacting us.
Output: no_flight