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: Hello. 
 agent: Hello, how can I guide you for today? 
 customer: Can you help me to book a business class flight ticket? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: My travel dates are May 05 and May 07. 
 agent: Can you please provide your source and destination airport codes? 
 customer: My airport codes are DEN and MSP. 
 agent: Do you have any airline preferences? 
 customer: I am comfortable with any airlines. 
 agent: Are you looking for a connecting flight or direct flight? 
 customer: I am looking for connecting flight. 
 agent: Do you have any other requirements that you are looking for? 
 customer: No, thanks for asking. 
 agent: Can you please provide your name to proceed further? 
 customer: My name is Thomas Scott. 
 agent: Sorry, there are no flights available at your request. 
 customer: No problem, thank you for the information. 
 agent: Thank you for contacting us, have a nice day.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how can I assist you? 
 customer: I am Benjamin Thompson, can you find a flight for me? I am planning for a trip from LAG to LAX. 
 agent: Ok, may I know your travelling details? 
 customer: My travelling dates are 08/29 and 08/31. Did you find any flight for me? 
 agent: Sorry, there is no flight available for you. 
 customer: That is fine. 
 agent: Thank you for reaching us. 
 customer: Thank you for your help.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how may I help you? 
 customer: Can you help me in booking from MSP to IAD, as there is a team outing? 
 agent: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight? 
 customer: My trip dates are Jul 30 to Aug 1. 
 agent: Do you have any connection limit? 
 customer: I need a connecting flight which return in evening. 
 agent: May I know your name? 
 customer: I am David Lopez. 
 agent: There is a connecting flight 1003 of Frontier airlines, can I proceed? 
 customer: You can reserve it. 
 agent: Sorry to say, there is no flight at evening time on your return journey. 
 customer: No issue, thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_flight