Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hi. I am Susan Moore. 
 agent: Hello, how may I render you today? 
 customer:  I want to book a connecting flight ticket to meet my grandparents at Detroit. Can you help me to book a flight ticket? 
 agent: Sure, we are here to help you. Can you please provide your take off and landing airport codes? 
 customer: Yes, my take off airport code is Boston, MA-BOS and landing point is MI-DTW. 
 agent: On which dates would you like me to book a flight ticket for you? 
 customer: I want a ticket on dates 07/27 and 07/29. 
 agent: Ok, please wait for a minute. 
 customer: Ok. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: That's ok. Thank you for the information. 
 agent: Thank you for opting us.
Student:
no_flight