You will be given a definition of a task first, then some input of the task.
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: Donna Lopez is here. 
 agent: How can I aid you today? 
 customer: My wish is to go for a trip to MSP from DFW along with my family. 
 agent: Ok. 
 customer: Will you be my helping hand in making a reservation? 
 agent: Sure, we are glad to assist you. 
 customer: Thank you. 
 agent: May I know your depart date? 
 customer: My departure date is 05/28. 
 agent: Do you have any preference? 
 customer: Price limit is 500. 
 agent: When you want to catch your return flight? 
 customer: 05/30 is my return date. 
 agent: Thanks for sharing your details. 
 customer: It's Ok. 
 agent: We found a plane 1021 of UA airline couple of connections. Shall I reserve? 
 customer: No, do not proceed. Thank you for aiding me. 
 agent: Ok, thank you for reaching us.
Output:
no_flight