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: Hi. 
 agent: Hello, How can I serve you? 
 customer: I need to book a flight ticket from Minneapolis & St. Paul to attend my friend's new company opening ceremony. Can you help me with it? 
 agent: Sure, May I know the journey codes? 
 customer: My trip is from MSP to DTW. 
 agent: Please help me with your travel dates and name. 
 customer: 06/25 is my depart date and 06/27 is my return date. I am Rebecca Clark. 
 agent: Please give a minute. 
 customer: Ok. 
 agent: Sorry, No flights found with your preferable dates. 
 customer: Ok, thank you for your help. 
 agent: Thank you for opting us.
A:
no_flight