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

customer: Hello. 
 agent: Hello, how can I help you? 
 customer: I have planned for a luncheons at Houston with family and friends. Could you please help me with booking a flight ticket from SFO to IAH? 
 agent: Sure, we are glad to help you. Let me know your trip dates. 
 customer: I want to depart on Nov 23 and arrive on Nov 25. 
 agent: Do you have any stopover in between journey? 
 customer: I prefer to travel in a connecting flight. 
 agent: Is there any other specifications for you? 
 customer: No, I do not have any other specifications. 
 agent: May I know your good name? 
 customer: I am Carolyn Evans. 
 agent: Sorry, no flights are available on your journey routes. 
 customer: No problem, thank you for the information. 
 agent: Thank you for contacting us.
no_flight