Detailed Instructions: 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, I am Sharon Mitchell. 
 agent: Hello, how may I address you? 
 customer: I have planned to meet my friend on his birthday, Can you please book a ticket on 01/14? 
 agent: Sure. May I know if you need any connections in between? 
 customer: Yes, I need a connection. 
 agent: When would you like to return on? 
 customer: I intend to return on 01/16. 
 agent: Can you provide me your airport codes? 
 customer: Sure, my source is San Francisco, CA - SFO. My destination is Minneapolis & St. Paul, MN - MSP. 
 agent: Thank you for giving your details. There are no flights available at this moment. 
 customer: Ok, Thank you for providing information. 
 agent: Thank you for choosing us.
A:
no_flight