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

Q: customer: Hello. 
 agent: Hello, how can I aid you today? 
 customer: Can you please help me to book a flight from BOS to SFO? 
 agent: Please provide your trip dates. 
 customer: Sure, I want to travel on Apr 13 and need to return on Apr 15. 
 agent: Do you need any connection limit? 
 customer: I need a flight with single connection. 
 agent: Is there any other specifications? 
 customer: My depart time must be in the evening. 
 agent: May I know your name? 
 customer: I am Virginia Parker. 
 agent: There are no flights available on your routes. 
 customer: Ok, not an issue. Thank you for checking. 
 agent: Thank you for choosing us.

A: no_flight
****
Q: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: Can you please reserve a flight ticket with the name of Paul Davis as I am planning to take my kids to centre for puppetry arts on 10/31? 
 agent: Sure, I am happy to help you. 
 customer: Thank you. 
 agent: May I know, from where you are planning to board? 
 customer: As my nearest airport is Houston, IAH, I want to board from here. 
 agent: When will you return to Houston? 
 customer: I would like to return on 11/02. 
 agent: Let me know your landing airport code to proceed further. 
 customer: Atlanta, ATL is my landing point. 
 agent: Thank you for sharing the details, wait for a while. 
 customer: Sure. 
 agent: Thanks for waiting. There is a connecting flight available with fare 200 in Southwest airline. Shall I proceed? 
 customer: No, do not proceed. I need a direct flight. 
 agent: Ok. 
 customer: Thank you for your information. 
 agent: Thank you for approaching us.

A: no_reservation
****
Q: customer: Hello. I am Dennis Campbell. 
 agent: Hello, how can I help you today? 
 customer: I am planning to attend music concert at OAK, can you please help me with booking a flight ticket from EWR? 
 agent: Sure, may I know your planned travel dates? 
 customer: Sure, I would like to take off on Feb 22 and return on Feb 24. 
 agent: Is there any class preference for you? 
 customer: No, but I would like to return during evening time. 
 agent: Do you have any other specifications? 
 customer: I need a flight with 1 connection. 
 agent: Sorry to say that, no flights were found with your given details. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for reaching us. 
 customer: You are welcome.

A:
no_flight
****