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. 
 customer: I am Paul Collins. 
 agent: How can I help you out? 
 customer: Could you help me in booking a flight ticket from SFO to DFW? 
 agent: Sure, Can you please let me know your planned trip dates? 
 customer: I will start on July 26, return on July 28. 
 agent: Is there any connection limit for you? 
 customer: I want direct flight. 
 agent: Please help me with your specific depart and arrival timings. 
 customer: My return time should be morning. 
 agent: Do you have any class preference? 
 customer: No. 
 agent: Is there nay other specifications to be met? 
 customer: I want normal cost airline. 
 agent: Thanks for providing details, no flights are available on your journey routes. 
 customer: Not an issue, thank you. 
 agent: Thank you for choosing us.
no_flight