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

Example input: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Example output: no_reservation
Example explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation
Q: customer: Hello. 
 agent: Hello, how can I aid you for today? 
 customer: Can you book a connecting flight from OAK to DFW? 
 agent: I am here to help you in booking your flight ticket. Can you please provide your planned dates of journey? 
 customer: July, 12 and July, 14 are my travel dates. 
 agent: Do you have any preference about the connection limit for your journey? 
 customer: I prefer to connecting flight. 
 agent: Do you have any other requirement to met with for your journey? 
 customer: I need to return at evening time. 
 agent: Can you please provide your name for further proceeding? 
 customer: Andrew Baker here. 
 agent: Sorry to say this Andrew Baker, I am not able to find any flights which travels to your region. 
 customer: That's ok, no problem. Thank you. 
 agent: You are welcome, thank you for reaching us.
A:
no_flight