Definition: 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: customer: Hello. 
 agent: Hello, how can I guide you for today? 
 customer: Will you please book me a flight ticket from DEN to AUS? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: I will start on July 28th and return on July 30th. 
 agent: Are you looking for a connecting flight or direct flight? 
 customer: I need 1 stop over. 
 agent: Do you have any class preferences? 
 customer: No. 
 agent: Do you have any other requirements that you are looking for? 
 customer: No, I am fine with above essentials. 
 agent: Can you please provide your name to proceed further? 
 customer: I am Sandra Taylor. 
 agent: Sorry, there are no flights available at your request. 
 customer: That's alright, thanks for your assistance. 
 agent: Thank you for contacting us, have a nice day.
Output:
no_flight