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 assist you today? 
 customer: I am Daniel Thomas. Can you please help me with booking a flight ticket from SFO to DFW? 
 agent: Thomas, can you provide us your travel dates? 
 customer: I would like to take off on 05/06 and return on 05/08. 
 agent: Thomas, can you please wait for a moment? 
 customer: Sure. 
 agent: Sorry Thomas, I have not found any flight on your preferred dates. 
 customer: That's ok, I will find an another alternate way to complete my trip. 
 agent: What else can I do for you? 
 customer: No, thank you for asking. 
 agent: Thank you for choosing us and have a nice day.
no_flight