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. 
 customer: I am Thomas Edwards. 
 agent: How can I assist you? 
 customer: Can you help me to cancel my reservation? 
 agent: Ok, I am here to help you. Can you please wait for a while. 
 customer: Sure, please check my reservation details. 
 agent: Sorry, no reservation found on your name to cancel. 
 customer: Oh! ok, no issues. Thank you for your time. 
 agent: Thank you for reaching us.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Edward Hill. 
 agent: How may I help you? Nice to meet you Edward. 
 customer: Help me in booking my flight ticket to New York LGA. 
 agent: Sure, tell me your travel dates please? 
 customer: My travelling dates will be 04 to 06 Jan. 
 agent: Now your source airport code please? 
 customer: My source code is OAK. 
 agent: Thanks for your patience. I have found Hawaiian airlines which flies with one connection. 
 customer: You can proceed. 
 agent: Sure, your flight ticket has been confirmed now. 
 customer: Thank you. 
 agent: Thank you.

Output: book


Input: Consider Input: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: Can you please help me with booking a flight ticket from DFW to LAS? 
 agent: Sure,  I will help you. Can I know your good name? 
 customer: My name is Susan Moore. 
 agent: May I know your depart date and arrival dates? 
 customer: My travel dates are Mar 27 and 29. 
 agent: Let me know your connection limit. 
 customer: I need a connecting flight. 
 agent: Do you have any preferences? 
 customer: I prefer business class. 
 agent: Please, wait a minute. 
 customer: Ok. 
 agent: I am sorry, there were no flights available that matches your requirements. 
 customer: Ok, no issues. 
 agent: Thank you for approaching us. 
 customer: Thanks for the help.
Output: no_flight